Garmin 255A User's Manual
Contents
1. ACT EHTZSTE HFT JEG TYFE YOR Press FLIPIFLOP Key To Set Selected Identifier Wpt Type Selected Freg As Active Figure 3 22 Selected Nav Database Frequency frequency as the Active frequency 7 Press the ENT key to set the selected frequency as the Standby 6 Press and release the FLIP FLOP key to set the selected frequency 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 13 A GARMIN Duplicate Identifiers 1 When duplicate identifiers are found press ENT ne 1 1 Gal Duplicate Identifiers Found ENT EMT DOHJE OUPLICATES FOUND Press the ENT Key to Save Press the CLR Key To Return the Displayed Value to the Previous Menu Figure 3 23 Selected Nav Database Frequency 2 Turn the SMALL knob to select the desired identifier and then press ENT and continue as described above LEGO a EMT ACCEPT CLR UMDo PEMOLE TOM Figure 3 24 Selected Ident from Nav Database 3 Set the selected identifier as the standby or active frequency Press ENT Key To Set Selected Freq As Standby JAY DATABASE Selected Frequency Press FLIP FLOP Key To Set Selected Identifier Wpt Type Selected Freq As Active Figure 3 25 Set Selected Frequency as Active or Standby 3 3 4 Nav Nearest VOR The GNC 255 when interfaced with an appropriate GPS receiver will report the 25 nearest VORS HEAREST WOR Turn SMALL Knob val 15 40 117 40 To Scroll Through ACT ENT STE UEG VOR Available VORs Figure 3 26 Nav Neare2. Com radio is locked to The external com remote transfer Com locked to 121 5 MHz COM RMT XFR switch has been 121 5 MHz Hold held and the com radio is tuned to remote com 121 5 To exit this mode hold the transfer key to exit com remote transfer COM RMT XFR switch for two seconds 4 4 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN Message COOLING FAN The cooling fan has failed DISPLAY Display board needs service GLIDESLOPE Glideslope receiver needs service GLIDESLOPE Glideslope receiver has failed POWER ALERT Unit will shut down if power switch is not restored immediately REMOTE KEY STUCK Com push to talk key is stuck 190 01182 01 Rev A Description The GTN cooling fan is powered but it is not turning at the desired RPM The display board is indicating that it needs Service The glideslope board is indicating that it needs service The glideslope board may continue to function The glideslope board is not communicating property with the system Power has been removed from the unit The Push To Talk key switch has been in pressed position for at least 30 seconds This input will now be ignored and the com radio will no longer transmit Garmin GNC 255A 255B Pilot s Guide Action Decrease cabin temperature and increase cabin airflow especially near the GTN to prevent damage to the unit Contact dealer for Service Co
3. J 2 Monitoring the Standby Com Channel cccccccsececseseeseees 2 2 27 SAVING a Comi Chanine et mei mnh mi ut e 2 2 2 2 4 Com Database LOOK U Pa uuunaunananancancca nenes ere zere es ere ree enen terre eee 2 4 275 Frequency Database Reverse LOO Kl U Po au uuuauuaaacancansa use nee eee zere 2 4 2 2 6 Emergency CANA da uu a0 uu una nana ann ann san e vue ene en ee ere vee ene zere recent 2 5 POM e A EEEE E E PEET 2 5 2 2 8 Remote Frequency Selection CON UTO la auuuuuuauuaaacanc aus ann ene e vecori 2 5 E 2 6 ll Selecting a Nav Freguengy vra d 2 6 23 2 Saving a Nav Channel i Vi 2 6 2 3 3 Listening to the Nav Audio Channel 2 7 Te 2 8 2 5 Distancelspeedi Time DST Display au uaau au ua uann ann c ane ane eneve ene eee eee rene eren 2 9 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide vii eM JL 3 3 3 4 3 5 3 6 vill A GARMIN PUD CTIONS gn E ceteris 3 1 ON GS DU nereann u Ene EEEE 2 1 So tee cnds E E E E E E ETE 3 2 SN Recent COM FreQUEN CI OS aaa aaa na nese re see ne eee eee rere reres rere eee a2 32 2 Com User Frequencies sea sea tures at er pere e 3 9 3 2 2 1 Viewing the Com User Frequency cccccscsecsssesseesessseteeseees 3 3 3 2 2 2 Deleting the Com User Frequency au au uaauuauuaana nuance esence eren 3 3 3 2 2 3 Editing a Com User Frequency u u auuaaa nana once s cancer e vec eren 3 4 U Com Database Frequencies ua uuoauauaaua nana ne vena ne zene ene eee r ene eee 3 5 3 24 Co
4. V Volume 1 2 W Warranty Index 2 Garmin GNC 255A 255B Pilot s Guide A GARMIN 190 01182 01 Rev A A GARMIN 2012 GARMIN Corporation GARMIN International Inc 1200 East 1515 Street Olathe Kansas 66062 U S A Tel 913 397 8200 or 800 800 1020 Fax 913 397 8282 Garmin AT Inc 2345 Turner Rd S E Salem Oregon 97302 U S A Tel 503 581 8101 or 800 525 6726 Fax 503 364 2138 Garmin Europe Ltd Liberty House Bulls Copse Road Hounsdown Business Park Southampton SO40 ORB U K Tel 44 0 870 850 1243 Fax 44 0 238 052 4004 GARMIN Corporation No 68 Zhangshu 2 Road Xizhi Dist New Taipei City 221 Taiwan R O C Tel 886 2 2642 9199 Fax 886 2 2642 9099 Garmin Singapore Pte Ltd 46 East Coast Road 05 06 Eastgate Singapore 428766 Tel 65 63480378 Fax 65 63480278 www garmin com https fly garmin com fly garmin Part Number 190 01182 01 Rev A
5. frequency switch has been in decrement key is pressed position for stuck at least 30 seconds This input will now be ignored This input is not available in all installations 4 6 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN Message Description Action REMOTE KEY The remote nav transfer Verity the NAV RMT XFR key STUCK NAV RMT XFR key switch is not stuck Contact dealer Nav remote switch has been in for service if this message persists transfer key is pressed position for stuck at least 30 seconds This input will now be ignored This input is not available in all installations VLOC RECEIVER The nav radio is Contact dealer for service Navigation receiver reporting that it needs needs service service The nav radio may continue to function VLOC RECEIVER The nav radio is Contact dealer for service Navigation receiver not communicating has failed property with the system Table 4 2 Messages 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 4 4 8 This page intentionally left blank Garmin GNC 255A 255B Pilot s Guide A GARMIN 190 01182 01 Rev A A GARMIN INDEX A Appendix 4 1 Basic operation 2 1 Brightness 3 19 C Cautions ii 2 6 Clear 1 3 Com database frequencies 3 5 3 6 3 7 3 8 3 9 Com frequencies 3 2 Com PTT 3 18 Com radio 2 1 Comjselect frequency 2 1 Com spacing 3 18 Com user frequencies 3 3 Com volume
6. that are in the database when the unit is receiving a valid position input Waypoint Types with a sign will have more frequencies for the same type 118 100 1122 800 Airport Identifier Shown For Fregs In Database Figure 2 8 Frequency Database Reverse Look Up EFDs CCA roo UNI 2 4 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 2 2 6 Emergency Channel 1 Press and hold the FLIP FLOP key or the Com Remote Transfer COM RMT XFR key for approximately two seconds lL 21 500 1 123 450 Figure 2 9 Emergency Channel 2 The Emergency Channel will be inserted into the Active Frequency position and the previous Active Frequency will become the Standby Frequency NOTE Pressing and holding the Com Remote Transfer COM RMT XFR key for approximately two seconds on units so configured will lock the COM board preventing further changes in Com frequency until the Com board is unlocked by pressing the Com Remote Transfer key again for two seconds The following message will notify the pilot that the Com board has been locked COM LOCKED TO 121 5 MHZ HOLD REMOTE COM TRANSFER KEY TO EXIT A NOTE Under some circumstances if the Com system loses communication with the main system the radio will automatically tune to 121 50 MHz for transmit and receive regardless of the displayed frequency 2 2 1 Stuck Mic The GNC 255 helps protect you from a situation where the microphone may get stuck i
7. 118 000 to 136 975 MHz in 25 kHz steps default For European operations a Com radio configuration of 8 33 kHz steps is also available The GNC 255 VHF Nav receiver operates from 108 MHz to 117 95 MHz decoding both the VHF Omni Range and Localizer navigation signals The built in Glideslope receiver will automatically tune the corresponding glideslope paired frequencies 328 MHz to 335 MHz when the localizer is tuned The GNC 255 is available in 10 and 16 watt com transmitter versions The GNC 255A is available with a 10 watt com transmitter The GNC 255B is available with a 16 watt com transmitter Locking Frequency Transfer Photo Sensor Screw FLIP FLOP Key Power On Off Com Volume oe Squelch On Off or 119100 124550 Nav VLOC KSLE TWR KSLE ATIS i ae Volume Nav ID A NODS On Off Frequency Adjust requency Monitor Key Enter Key Com or Nav Clear Data Key Frequency Selection Function Selection OBS Selection To From Selection Figure 1 1 GNC 255 Front Panel Description 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 1 1 A GARMIN 1 2 Pilot Controls The GNC 255 controls have been designed to simplify operation of the system and minimize workload and the time required to access sophisticated functionality Controls are comprised of dual concentric knobs for frequency tuning Com volume squelch knob Nav volume ID knob and bezel keys 1 2 1 Power Com Volume Squelch Knob The Power Com Volume
8. 975 kHz in 25 kHz steps or 000 and 990 kHz in 8 33 kHz steps 4 Turn the LARGE and SMALL knobs clockwise to increase and counterclockwise to decrease the frequency values Standby frequency selection is not inhibited during transmit C N 5 When connected to a position source nearby station identifiers will be shown for the selected frequency Frequencies with multiple types will have an asterisk next to the identifier ACT 1 24 390 P rd STE 1 l B l 00 Asterisk Indicates Multiple Types KPDS GH Exist For The Selected Frequency Identifier and Type Shown For The Selected Frequency Figure 2 1 Com Frequency Selection 6 Press and release the FLIP FLOP key to toggle the Standby frequency to the Active frequency 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 2 1 A ee GARMIN 2 2 2 Monitoring the Standby Com Channel The Frequency Monitoring function allows you to monitor the Standby frequency for activity while listening to the Active frequency mon Press the MON key in the Com function to listen to the standby frequency A small MN will replace the STB to the left of the Standby frequency Monitor Annunciation _ Standby Cor 8 p r Frequency Being 123 450 1131950859 Go ACTIVE COM STANDBY Figure 2 2 Com Frequency Monitor Annunciation When the Active frequency receives a signal the unit will switch automatically to the Active frequency The Active frequency quality is not affecte
9. GARMIN 2 5 Distance Speed Time DST Display When the GNC 255 has received data from an external device such as a GPS receiver or DME sensor through the serial port DST data will be available If you are not connected to an external sensor you will not see this display T F It DST data is not shown pressing the T F key will show DST data in the lower part of the display LZ21 900 121 400 Station Identifier AR Ns eter sa a oe a Sa Bearing To From Station Active Nav Frequency Distance To Station Time To Station In In Nautical Miles Hours and Minutes Ground Speed From GPS Unit In Knots Figure 2 15 DST Data Display NOTE The If both GPS and DME data sources are connected to the GNC and dashes are displayed when distance speed time data is expected to be displayed press the T F key to prompt the GNC to display DST data 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 2 9 2 10 This page intentionally left blank Garmin GNC 255A 255B Pilot s Guide A GARMIN 190 01182 01 Rev A A GARMIN 3 FUNCTIONS The Functions section allows provides information about Com Frequencies Nav Frequencies Internal Communications System ICS Configuration System Configuration SYS and Timers TMR 3 1 Functions Description Recent Freqs User Freqs Database Nearest Apt Nearest ACC Nearest FSS Nearest WX Nav Freq Recent Freqs User Freqs Database Nearest VOR ICS Contig Adjust Intercom Aux Audio Int
10. Turn the LARGE knob to select the Waypoint Type field Q 6 Turn the SMALL knob to select the Waypoint Type 124550 Pese 2 SS es TT EAT 15 Select Wot Type Figure 3 8 Com User Frequency Type Selection 7 After selecting the Waypoint Type press ENT to accept changes to the User Frequency 3 4 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 3 2 3 Com Database Frequencies The GNC 255 contains a large database of Com frequencies that may be recalled by identifier 118 250 Kela Turn SMALL Knob EMT DOME MC HARY To Select Character Turn LARGE Knob To Move Cursor Figure 3 9 Com Database Frequencies Press FUNC to access the Functions With the Com Frequency Function highlighted turn the SMALL knob to view the Com Database function Then press ENT Turn the SMALL knob to select the desired character Turn the LARGE knob to move the cursor to highlight a character Repeat steps 2 and 3 to complete the desired identitier and then press the ENT key If available the Frequency Type will be highlighted Turn the SMALL knob to select the desired frequency Press ENT Key To Set Selected Freg As Standby Selected Frequency F HCT EMT iTE HET RKSLE TYFE Turn SMALL Knob Press FLIPIFLOP Key To Set Selected Identifier To Select Freq Type Selected Freq As Active Figure 3 10 Selected Com Database Frequency 6 Press and release the FLIPIFLOP key to set the selected frequ
11. device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation NOTE This product its packaging and its components contain chemicals known to the State of California to cause cancer birth defects or reproductive harm This notice is being provided in accordance with California s Proposition 65 If you have any questions or would like additional information please refer to our web site at www garmin com prop65 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN A NOTE Canadian installations In accordance with Canadian Radio Specifications Standard 102 RSS 102 RF field strength exposure to persons from an antenna connected to this device should be limited to 60 V m for controlled environment and 28 V m for uncontrolled environment 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide li NOTE This device complies with Part 15 of the FCC limits for Class B digital devices This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications Furthermore there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmiul int
12. shall be responsible for any transportation cost This warranty does not apply to i cosmetic damage such as scratches nicks and dents ii consumable parts such as batteries unless product damage has occurred due to a defect in materials or workmanship iii damage caused by accident abuse misuse water flood fire or other acts of nature or external causes iv damage caused by service performed by anyone who is not an authorized service provider of Garmin or v damage to a product that has been modified or altered without the written permission of Garmin In addition Garmin reserves the right to refuse warranty claims against products or services that are obtained and or used in contravention of the laws of any country THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES WHETHER EXPRESS IMPLIED OR STATUTORY INCLUDING ANY LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE STATUTORY OR OTHERWISE THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS WHICH MAY VARY FROM STATE TO STATE IN NO EVENT SHALL GARMIN BE LIABLE FORANY INCIDENTAL SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES WHETHER RESULTING FROM THE USE MISUSE OR INABILITY TO USE THE PRODUCT OR FROM DEFECTS IN THE PRODUCT SOME STATES DO NOT ALLOW THE EXCLUSION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU Garmin retains the exclusive right to repair or rep
13. to the main menu 3 22 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 3 6 Timers The GNC 255 has both Count Up and Count Down timers which may operate simultaneously and are shown in the lower right of the Com Nav displays The countdown timer always takes precedence if it is running 3 6 1 Setting Up the Count Down Timer 1 Press FUNC to access the Functions Turn the LARGE knob to select the Timer TMR function Turn the SMALL knob to select either the Count Down Timer function Now press the ENT key CONFIG lk ATIC iH 118 250 pj shi TE a a Figure 3 41 Select the Count Down Timer Function 2 Press the ENT key to Start or Stop the timer Press the CLR key to reset the timer to the starting value Press the CURSOR knob to select a starting timer value Select Count Down Timer The Default Starting Value Push the CURSOR SMALL Knob to Edit the Starting Time Value Press ENT to Start Press CLR to Reset the Timer or Stop the Timer to the Default Value Figure 3 42 Selecting the Count Down Timer 3 Turn the SMALL knob to select the timer value and turn the LARGE knob to move the cursor After completing the time setting press the ENT key Press ENT again to start the timer Turn SMALL Knob To Select Time Value ml 18 250 ET T i TIMER EMT ACCEPT CLRSUND 118 250 EMT ACCEPT CLRSUNDO Press ENT to Accept Press CLR to Return Turn LARGE Knob To Move Cursor the
14. 0 117 40 Ky 2 Turn the LARGE knob to change the values in one MHZ Identifier and Type Shown For The Selected Frequency udi WOR UEG WOR Figure 2 10 Nav Frequency Selection CAUTION The Identifier is determined from the database and is not the decoded Nav Identifier 4 Press and release the FLIP FLOP key to toggle the Standby frequency to the Active frequency NOTE Both Nav and Com frequencies cannot be displayed at the same time 2 3 2 Saving a Nav Channel The current Standby frequency may be saved into the Nav User Frequency database trom the Nav or the Nav User Function The Nav User Frequency database can hold up to 15 frequencies 1 Press ENT The Waypoint name field will be active Turn the SMALL knob to select characters Turn the LARGE knob to move the cursor l1840 11540 ci ENT UJ EMT D0ME CLR UMDO WET Cyvfj__ TYFE Figure 2 11 Nav User Frequency Name Selection 4 After selecting the desired characters press ENT 2 6 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 5 Turn the LARGE knob to select the waypoint Type 6 Turn the SMALL knob to select characters 1 Turn the LARGE knob to move the cursor lle90 11640 ci EMT DORE CLR UNOY WHET CvO___TYTFE Biel Figure 2 12 Nav User Frequency Type Selection 8 After selecting the desired characters press ENT Frequency Type Symbol Description DME Localize Table 2 2 Nav Frequency Type List
15. 0ME CLR UND WET rri TYFE Figure 3 19 Nav User Frequency Name Selection After selecting the desired characters press ENT Turn the LARGE knob to select the waypoint Type Turn the SMALL knob to select characters and Turn the LARGE knob to move the cursor EDIT USER I m pj 115 40 EHTSOIHE CLR UMDO HET Ovo TTFE Figure 3 20 Nav User Frequency Type Selection 1 After selecting the desired characters press ENT Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 3 3 3 Nav Database Frequencies The GNC 255 contains a large database of Nav frequencies that may be recalled by identifier 1 Press FUNC to access the Functions With the Nav Frequency Function highlighted turn the SMALL knob to view the Nav Q Database function Then press ENT 2 Turn the LARGE knob to move the cursor to highlight a ENT character Turn SMALL Knob To Select Character EMT D0HE FHTER IDEHTIFTEF Turn LARGE Knob To Move Cursor Q 3 Turn the SMALL knob to select the desired character Press the ENT Key to Save Press the CLR Key To Return the Displayed Value to the Previous Menu Figure 3 21 Nav Database Frequencies 4 Repeat steps 2 and 3 to complete the desired identifier and then press the ENT key 5 If available the Frequency Type will be highlighted Turn the SMALL knob to select the desired frequency Press ENT Key To Set Selected Freq As Standby JAY DATABASE 7 400 Selected Frequency
16. 1 2 Contrast 3 20 Controls 1 2 Cursor 1 3 Customer service i 4 1 D Database frequencies 3 5 3 13 4 3 Database look up 2 4 Display brightness 3 19 DST 2 9 Duplicate identifiers 3 14 E Emergency channel 2 5 Enter 1 3 F Flight Service Station 3 8 FLIPIFLOP key 1 3 Fly Garmin v 3 22 4 1 4 3 Frequency monitoring 2 2 Front panel description 1 1 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide FSS 3 8 Functions 1 4 3 1 G Getting started 1 1 I ICS 3 15 ID 1 2 Intercom 3 17 K Knobs 1 3 L Locking screvv 1 1 M Menus 1 3 Message 4 4 Monitoring 1 4 2 2 Morse code 1 1 N Nav audio 2 7 Nav database frequencies 3 13 Nav frequencies 3 10 Nav ID 1 2 Nav radio 2 6 Nav Select frequency 2 6 Nav user frequencies 3 11 Nav volume 1 2 Nearest airport 3 6 3 7 O OBS mode 1 3 2 8 P Pilot controls 1 2 Power on 2 1 Power up 3 22 Product description 1 1 Product Support v 4 1 Index 1 R Recent com frequencies 3 2 Recent nav frequencies 3 10 Record of Revisions vi Registration v Remote frequency control 2 5 Reverse look up 2 4 Revisions vi S Saving a com channel 2 2 Saving a nav channel 2 6 Serial Number 3 22 Software version 3 22 Speaker On Off 3 17 Squelch 1 2 Stuck mic 2 5 Support v System configuration 3 18 T Timers 3 23 To From 1 3 Troubleshooting 4 1 4 4 U Updating frequency database 4 3 USB 1 4 3 21 User frequencies 3 3 3 11
17. 2 3 3 Listening to the Nav Audio Channel Nav ident is enabled by pressing the Nav Volume knob when the Nav display is active When Nav ident is enabled the ID annunciation will appear to the left of the active Nav frequency l 1 40 er 1 l 5 40 HAY ACTIVE HAY STANDBY Figure 2 13 Listening to the ID for a Nav Frequency Nav audio volume is adjusted using the Nav Volume knob Turn the Nav Volume knob clockwise to increase volume or counterclockwise to decrease volume 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 2 1 A GARMIN 2 4 OBS Mode If your system is configured with an external CDI HSI the OBS radial of your remote display will be decoded and displayed on the screen of the GNC 255 NOTE The Identifier is the decoded Nav Identifier from the Morse code broadcast by the station ops 1 Press the OBS key to see the current OBS setting and graphic CDI 2 Use the LARGE and SMALL knobs to change the displayed OBS values The GNC 255 graphic CDI is shown as a graph of five dots right or lett of the triangle icon Each dot indicates two degrees deflection with ten degrees full deflection to each side Fly towards the bar to be on course Active Nav MAN Frequency Ja a enl 15 4 40 K el Le 40 Reference Com ARAME aiina A Ca i Frequency OBS Setting To From Indication for CDI Deflection Selected Station Figure 2 14 CDI Display 2 8 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A
18. 29 9296 e mail support gat garmin com http Awww garmin com https ily garmin com fly garmin 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 4 1 A GARMIN Problem Possible Cause Action GNC 255 does not power on No power to the Check power connections GNC 255 breakers and main avionics switch Faulty electrical Contact your dealer to wiring or connection perform electrical system test No Nav audio Output disabled or Contact dealer set to a low level Nav audio in Com Mixed with Com Contact dealer feature GNC 255 does not transmit No power to Com Check power connections Mic key connection Check Mic key input connection Intercom doesn t function It can be enabled Check connections or disabled via a remote mounted switch or via the menu No voice activation Check ICS page Intercom or if must talk too On Off Adjust Intercom loud Can t change active frequency Com Radio not If in Lock Out mode communicating The press the external Com radio may also be in FLIP FLOP key for two lockout mode In this seconds to return to case the radio would normal operation or cycle be tuned to 121 50 the avionics power If the and the active freg condition persists contact would not be able to dealer be changed OBS readout displays Resolver failure Contact dealer Calibration error Recalibrate resolver 4 2 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN Probl
19. 5 Set Display Contrast w 2 Turn the SMALL knob to set the value Then press the ENT key ENT 3 5 4 Database Info The Database information for the GNC 255 unit is displayed This information is useful when contacting Customer Support 1 Press FUNC to access the Functions Turn the LARGE knob to select the SYS Function Turn the SMALL knob to view the Database Version function Then press the ENT key DATABASE IHF wth 18 250 a Se ee Database Cycle Figure 3 36 Database Info Display 2 Press the FUNC key to return to the main display i Slot Database Effectivity Date 3 20 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 3 5 5 Load Database The GNC 255 has a USB connector to allow for easily updating the system databases NOTE Garmin recommends the use of a USB 2 0 compatible USB flash drive for updating the database 1 Insert the supplied cable into the USB port on the top right corner of the GNC 255 2 Insert the USB memory device into the other end of the cable USB Port USB Cable USB Memory Device Figure 3 37 USB Update Progress a 3 Press FUNC to access the Functions Turn the LARGE knob to select the SYS Function Turn the SMALL knob to view the Load Database function Then press the ENT key i os UPDATE FRESS ENT TO LOAD DATABASE FROM USE CLA TO CANCEL Figure 3 38 Database Update Display TE 4 Verity the database version on USB Then press th
20. ARNING For safety reasons GNC 255 operational procedures must be learned on the ground CAUTION The Garmin GNC 255 does not contain any user serviceable parts Repairs should only be made by an authorized Garmin service center Unauthorized repairs or modifications could void both the warranty and the pilot s authority to operate this device under FAA FCC regulations CAUTION The GNC 255 display uses a lens coated with a special anti reflective coating that is very sensitive to skin oils waxes and abrasive cleaners CLEANERS CONTAINING AMMONIA WILL HARM THE ANTI REFLECTIVE COATING It is very important to clean the lens using a clean lint free cloth and an eyeglass lens cleaner that is specified as safe for anti reflective coatings NOTE Garmin recommends that if flying in a region with 8 33 kHz COM channel spacing the radio should remain in 8 33 kHz mode This will prevent the loss of stored user and recent frequencies NOTE Do not use outdated database information Databases used in the system must be updated regularly in order to ensure that the information remains current Pilots using an outdated database do so entirely at their own risk NOTE All visual depictions contained within this document including screen images of the GNC 255 bezel and displays are subject to change and may not reflect the most current GNC 255 software Depictions of equipment may differ slightly from the actual equipment NOTE This
21. GNC 255A 255B Pilot s Guide 119 100 124 550 KSLE THR KSLE ATIS PUSH SQ NAV 3 8 voj S R S D SS CIN OBS T F FUNC CLR ENT Fiii PUSH ID CRSR VOL 2012 Garmin Ltd or its subsidiaries All rights reserved This manual reflects the operation of System Software version 2 00 or later Some differences in operation may be observed when comparing the information in this manual to later software versions Garmin International Inc 1200 East 151st Street Olathe KS 66062 U S A Tel 913 397 8200 Fax 913 397 8282 Garmin AT Inc 2345 Turner Road SE Salem OR 97302 U S A Tel 503 391 3411 Fax 503 364 2138 Garmin Europe Ltd Liberty House Bulls Copse Road Hounsdown Business Park Southampton S040 9RB U K Tel 44 0 870 850 1243 Fax 44 0 238 052 4004 Garmin Corporation No 68 Zhangshu 2nd Road Xizhi Dist New Taipei City 221 Taiwan R 0 C Tel 886 02 2642 9199 Fax 886 02 2642 9099 Garmin Singapore Pte Ltd 46 East Coast Road 05 06 Eastgate Singapore 428766 Tel 65 63480378 Fax 65 63480278 At Garmin we value your opinion For comments about this guide please e mail Techpubs Salem Garmin com www garmin com https fly garmin com tly garmin Except as expressly provided herein no part of this manual may be reproduced copied transmitted disseminated downloaded or stored in any storage medium for any purpose without the express written permission of Garmin Gar
22. Selected Value to the Default Value Figure 3 43 Setting the Count Down Timer Value 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 23 A LUG ARMIN 3 6 2 Setting Up the Count Up Timer 1 Press FUNC to access the Functions Turn the LARGE knob to select the Timer TMR function Turn the SMALL knob to select the Count Up Timer function Now press the ENT key COM FREQUENCY LIST Ic COMP IGURAT IOP SYS COME IGURAT LOM Select Count Up Timer Figure 3 44 Select the Count Up Timer Function 2 Press the ENT key to Start or Stop the timer Press the CLR key to reset the timer to 0 00 The Default Starting Value COUNT OF 00 00 00 EHT TART STOP CLRZRESET Press ENT to Start Press CLR to Reset the Timer or Stop the Timer to 0 00 Figure 3 45 Selecting the Count Up Timer 3 6 3 Viewing Timers in the Com Display When a timer is active the timer value will be shown in the lower right corner of the Com display While both timers may be actively counting at the same time the Count Down Timer will have precedence in being shown If the Count Down Timer is paused the Count Up Timer will then be shown until the Count Down Timer is restarted 118 290 131 990 COM ACTIVE oo 06 53 Timer Value Figure 3 46 Timer Value Shown in the Com Display 1 Pressing CLR and then ENT will reset the displayed Timer A 18 250 131 350 OO O4 on 3 47 Stop or Clear the Timer in the Com oe 2 Pre
23. Squelch knob located in the top left corner of the bezel controls audio volume for the Com radio Rotating the knob clockwise past the detent turns power on and counter clockwise turns power off When the Com radio is active press the Power Com Volume Squelch knob to toggle automatic squelch control On Off for the Com radio Com Mode Annunciator Squelch TX or RX Annunciator Active Frequency jikil vie Active Nav Annunciator Sa acti 10 00 Frequency Com Volume Bar Graph Standby Frequency Annunciator Figure 1 2 Com Volume and Squelch Display Description The Com radio features an automatic squelch to reject many localized noise sources You may override the squelch function by pressing the Power Com Volume Squelch knob This facilitates listening to a distant station or setting the desired volume level To override the automatic squelch press the Power Com Volume Squelch knob momentarily Press the Power Com Volume Squelch knob again to return to automatic squelch operation A SQ indication appears to the left of the active Com frequency window in the upper left corner of the display when automatic squelch is overridden 1 2 2 Nav Volume ID Knob NAV The Nav Volume ID knob located in the bottom left corner of the bezel controls audio volume for the Nav radio Press the Nav Volume ID knob and the Morse code tones will be heard mere When Morse code tone is active ID will appear to the left of the Nav active fre
24. arest ACC Frequencies 1 Press FUNC to access the Functions With the Com Frequency Function highlighted turn the SMALL knob to view the Com Nearest ACC function Then press ENT FUNC 2 Turn the SMALL knob to display the available ACCs 3 Press the ENT key to insert the highlighted trequency as the Standby trequency Or press the CLR key to return to the Functions display 4 Press and release the FLIP FLOP key to set the selected frequency as the Active frequency 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 1 A GARMIN 3 2 6 Com Nearest Flight Service Station FSS Frequencies The GNC 255 when interfaced with an appropriate GPS receiver will report the 25 nearest Flight Service Station FSS frequencies 124 550 127600 SELADA 4 ACT EMT STE HC leel 600 Available Frequencies Figure 3 13 Com Nearest FSS Frequencies 1 Press FUNC to access the Functions With the Com Frequency Function highlighted turn the SMALL knob to view the Com Nearest FSS function Then press ENT FUNC 2 Turn the SMALL knob to display the available FSS frequencies 3 Press the ENT key to insert the highlighted trequency as the Standby trequency Or press the CLR key to return to the Functions display 4 Press and release the FLIP FLOP key to set the selected frequency as the Active frequency 3 8 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 3 2 7 Com Nearest Weather WX Fr
25. d The Frequency Monitor function is turned off by pressing the MON key again Monitoring is not canceled by switching to Nav mode 2 2 3 Saving a Com Channel The current Standby frequency may be saved into the Com User Frequency database from the Com display or the Com User Function The Com User Frequency database can hold up to 15 frequencies NOTE When switching from 8 33 kHz to 25 kHz mode any 8 33 kHz specific user frequencies will be deleted from the user frequency list This only affects the user frequencies within the 8 33 kHz spectrum 1 Press ENT The Standby frequency is selected and the Waypoint name field will be active 2 Turn the SMALL knob to select characters 3 Turn the LARGE knob to move the cursor SAVE USER FREG Number of 123 460 131 950 or T Frequencies Saved EMT ACCEPT CLRSEUMoo HET RSL Turn SMALL Knob To Select Character Press the ENT Key to Save Press the CLR Key To Revert Turn LARGE Knob the Displayed Value to the Previous Value To Move Cursor Figure 2 3 Com User Frequency Name Selection ENT 4 After selecting the desired characters press ENT 2 2 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 5 Turn the LARGE knob to select the waypoint Type 6 Turn the SMALL knob to select the Type trom the list SH am Ua JUSEF FREH E TE AT 159 Selected Wot Type Figure 2 4 Com User Frequency Type Selection Frequency Type Symbol Description Departure Re
26. d Timer Pressing the FUNC key once displays the Function mode Pressing the FUNC key a second time exits the Function mode 1 2 11 MON Monitor Key MON The MON Monitor key will engage the monitor function where the Standby frequency may be monitored while still listening to the Active frequency 1 3 USB Port The USB port is used to update the frequency database in the GNC 255 NOTE Garmin recommends the use of a USB 2 0 compatible USB flash drive for updating the database 1 4 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 2 BASIC OPERATION 2 1 Power On Turn the GNC 255 on by either turning the Power Com Volume Squelch knob clockwise to turn the power on or if installed turning on the master switch that powers the radios 2 2 Com Radio 2 2 1 Selecting a Com Frequency New frequencies are first selected as a Standby frequency and then toggled to the Active side with the FLIP FLOP key While viewing the Standby frequency display use the LARGE and SMALL knobs on the right side of the GNC 255 to select the desired frequency 1 Press C N if necessary to reach the Com radio function The COM annunciator on the top line of the display will show Turn the LARGE knob to change the values in one MHz increments The MHz selection range is between 118 and 136 in one MHz steps 3 Turn the SMALL knob to change the values in 25 kHz or 8 33 kHz increments The kHz selection range is between 000 and
27. dby Active Freguenc SSeS Position In List sale ml 18 2 0 hae Eee Turn SMALL Knob 4 ACT EMT 3TE To Select Entry Press FLIP FLOP Key To Set Selected Frequency Selected Freq As Active Figure 3 15 Recent Nav Frequencies 2 Turn the SMALL knob to select an Entry 1 20 If a GPS position is available the area below frequency will show the nearest facility name type if available 3 Press and release the FLIP FLOP key to transfer the displayed channel to the Active frequency position or press the ENT key to transfer the displayed channel to the Standby frequency position 3 10 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 3 3 2 Nav User Frequencies Up to 15 Nav User Frequencies can be saved with an assigned waypoint WPT identifier and Type 3 3 2 1 Viewing the Nav User Frequency 1 Press FUNC to access the Functions Turn the LARGE knob to select the Nav Frequency List Function Turn the SMALL knob Q to view the Nav User Frequency function Then press ENT Press ENT Key To Set ENT Selected Freq As Standby Active Frequency HAv USER FREGE Position In List 118 4 D i ME Turn SMALL Knob ACT ENMT 2TE al I JEG TRE YOR To Select Entry Press FLIP FLOP Key To Set Selected Frequency Selected Freq As Active Figure 3 16 Viewing User Nav Frequencies 2 Turn the SMALL knob to view the Nav User Frequencies 3 Press and release the FLIP FLOP key to set the displayed frequency a
28. e ENT key Updating will begin automatically DATABAZE VERSIONE IHSTALLELCI OM DRIVE e E 111s mma a m E tebe Figure 3 39 Verify Database Version 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 21 A GARMIN 5 Wait until the updating process is complete and then remove the memory device and cable The unit will reset automatically once the database is updated 6 Verity the correct frequency database is loaded after power up 3 5 6 Software Version The software versions of the GNC 255 unit are displayed This information is useful when contacting Customer Support 1 Press FUNC to access the Functions Turn the LARGE knob to select the SYS Function Turn the SMALL knob to view the w Software Version function Then press the ENT key REESE Display Software Version oe 9 od ee O00 CoM 2 11b Com Software Version HA E O1 Nav Software Version Figure 3 39 Software Versions Display 2 Press the FUNC key to return to the main menu 3 5 7 Serial Number The serial number of the GNC 255 unit is displayed This information is useful when contacting Customer Support 1 Press FUNC to access the Functions Turn the LARGE knob to select the SYS Function Turn the SMALL knob to view the Serial Number function Then press ENT S N 2AS000001 Unit Serial Number 0049F 0202060518 ID Is Used With The flyGarmin Services Figure 3 40 Serial Number Display 2 Press the FUNC key to return
29. em Possible Cause Action Display shows Corrupted system Contact factory Incorrect Calibration calibration Checksum at start up parameters Table 4 1 Troubleshooting 4 2 Updating the Frequency Database The GNC 255 uses a standard USB memory device to load the frequency database into the GNC 255 The memory device is not provided by Garmin The Frequency database is stored internally and the USB memory device is only used to transfer the database into the unit The Garmin databases can be updated by following the instructions on https fly garmin com fly garmin The following equipment is required to perform the update e Windows compatible PC computer Windows 2000 XP Vista or Windows 7 recommended USB 2 0 compatible USB flash drive e External USB cable e Updated database obtained from the Garmin web site NOTE The data contained in the frequency database comes from government agencies Garmin accurately processes and cross validates the data but cannot guarantee the accuracy and completeness of the data 4 2 1 Downloading the Frequency Database The Frequency database is updated on a 28 day cycle Frequency database updates are provided by Garmin and may be downloaded from the Garmin web site https fly garmin com fly garmin 4 2 2 Updating the GNC 255 Frequency Database See Section 3 5 5 for details on updating the database 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 4 3 A GARMIN 4 3 Messa
30. ency as the Active frequency 7 Press the ENT key to set the selected frequency as the Standby frequency 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 30 amp n GARMIN 3 2 4 Com Nearest Airports APT The GNC 255 will report the 25 nearest Airports APT when interfaced with an appropriate GPS receiver 124 550 Siz SH EMT DOME ALBANY MUH Available Airports Figure 3 11 Com Nearest APT Frequencies 1 Press FUNC to access the Functions With the Com Frequency Function highlighted turn the SMALL knob to view the Com Nearest APT function Then press ENT FUNC ENT 2 Turn the SMALL knob to display the available airports Press the ENT key to select the displayed airport The frequency type will be highlighted Turn the SMALL knob to select the desired frequency type 3 Then press the ENT key to set the displayed airport trequency as the Standby or press and release the FLIP FLOP key to set it as the Active trequency Or press the CLR key to return to the Functions display 3 6 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 3 2 5 Com Nearest Area Control Center ACC Frequencies The GNC 255 when interfaced with an appropriate GPS receiver will report the 25 nearest Area Control Center ACC frequencies ACCs are also known as Air Route Tratfic Control Centers ARTCC 124 550 151400 KAT ACT ENT 5TE SEATTLE Available Frequencies Figure 3 12 Com Ne
31. ene en ne ece 3 23 3 0 2 Setting Up the Count Up Timer aa uauuaau nan ua aa ane ane vec ene z re vec even 3 24 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 203 Viewing Timers in the Com Display ccccccccececssseseeeees 3 24 AT ee ee ee 4 1 A1 WOUIDI S MOON 4 1 4 2 Updating the Frequency Database ua aaaanaaaaae ac e ann ene e eee eee enen 4 3 4 2 1 Downloading the Frequency Database ccccccseeseeseeseeeseees 4 3 4 2 2 Updating the GNC 255 Frequency Database cceceeeeees 4 3 I ck en E E E ae ee ae 4 4 YING Cease cen ccc cage cee E E O ee es Index 1 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide IX A GARMIN This page intentionally left blank Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 1 GETTING STARTED 1 1 Product Description Combining a powerful VHF communications transceiver with 200 channel VOR Localizer and Glideslope receivers the GNC 255 provides a full tunctioned navigation and communications solution in a small footprint at a very affordable price Besides traditional Nav Com features the GNC 255 also incorporates workload reducing functions such as automatic decoding of the Morse code station identifier for VOR LOC most used frequency storage in memory built in course deviation indicator and more The GNC 255 has the ability to monitor the standby Com frequencies The GNC 2555 Com radio operates in the aviation voice band from
32. equencies The GNC 255 when interfaced with an appropriate GPS receiver will report the 25 nearest Weather WX frequencies 124 550 24550 SEA 4 ACT EMT 5TE ESLE ATIS Available Frequencies Figure 3 14 Com Nearest Weather Frequencies 1 Press FUNC to access the Functions With the Com Frequency Function highlighted turn the SMALL knob to view the Com Nearest Weather function Then press ENT FUNC 2 Turn the SMALL knob to display the available Weather frequencies 3 Press the ENT key to insert the highlighted frequency as the Standby trequency Or press the CLR key to return to the Functions display 4 Press and release the FLIP FLOP key to set the selected frequency as the Active frequency 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 9 A GARMIN 3 3 Nav Frequencies The Nav Frequencies category in the Functions section contains remotely acquired frequencies Remote recently used frequencies Recent user defined frequencies User and a database of all frequencies provided in the standard default memory Database 3 3 1 Recent Nav Frequencies The last 20 Nav frequencies used are kept in the list of Recent Nav Frequencies and can be accessed in this function 1 Press FUNC to access the Functions Turn the LARGE knob to select the Nav Frequency Function Turn the SMALL knob w to view the Recent frequency function Then press ENT Press ENT Key To Set ENT Selected Freq As Stan
33. erterence the user is encouraged to try to correct the interference by relocating the equipment or connecting the equipment to a different circuit than the affected equipment Consult an authorized dealer or other qualitied avionics technician for additional help if these remedies do not correct the problem Operation of this device is subject to the following conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation IV Garmin GNC 255A 255B Pilot s Guide A GARMIN To obtain accessories for your unit please contact your Garmin dealer Help us better support you by completing our on line registration form today Registration ensures that you will be notitied of product updates and new products and provides lost or stolen unit tracking Please have the serial number of your unit handy connect to our web site www garmin com and look for our Product Registration link on the Home page The display surface is coated with a special anti reflective coating which is very sensitive to skin oils waxes and abrasive cleaners It is very important to clean the lens using an eyeglass lens cleaner which is specified as safe for anti reflective coatings and a clean lint free cloth 190 01182 01 Rev A A GARMIN Product Registration and Support Help us better support you by completing your online registratio
34. ges When a Message has been issued by the unit the Message will be shown on the display After viewing the messages touch the ENT key to acknowledge the message and return to the previously viewed page An acknowledged message will not be redisplayed even if the condition persists Messages provide an aid to troubleshooting system operation COH PUSH TO TALE KEY 15 STU E Message Press ENT To Acknowledge EMT ACCEPT Figure 4 1 Message Com PTT Key Stuck Message Description Action COM RADIO The com radio is Cycle the power to the COM radio Com radio needs reporting that it needs Contact dealer for service service service The com radio may continue to function COM RADIO The com radio is not Press and hold the volume Knob or Com radio may be communicating properly the external com remote transfer inoperative with the system COM RMT XFR switch if installed this will force the com radio to 121 5 MHz Contact dealer for service COM RADIO Com radio is Decrease length of com Com overtemp in overtemp or transmissions decrease cabin or undervoltage undervoltage mode temperature and increase cabin Reducing and transmitting power airflow especially near the GTN transmitter power has been reduced to Check aircraft voltage and reduce prevent damage to the electrical load as necessary com radio Radio range Contact dealer for service if this will be reduced message persists COM RADIO
35. lace with a new or newly overhauled replacement product the product or software or offer a full retund of the purchase price at its sole discretion SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY Online Auction Purchases Products purchased through online auctions are not eligible for warranty coverage Online auction confirmations are not accepted for warranty verification To obtain warranty service an original or copy of the sales receipt from the original retailer is required Garmin will not replace missing components from any package purchased through an online auction International Purchases A separate warranty may be provided by international distributors for devices purchased outside the United States depending on the country If applicable this warranty is provided by the local in country distributor and this distributor provides local service for your device Distributor warranties are only valid in the area of intended distribution Devices purchased in the United States or Canada must be returned to the Garmin service center in the United Kingdom the United States Canada or Taiwan for service To obtain warranty service contact your local Garmin Authorized Service Center For assistance in locating a Service Center near you visit the Garmin web site at http www garmin com or contact Garmin Customer Service at 866 739 5687 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide A GARMIN W
36. m Nearest Airports APT aa uaaauaaunaa nanen ana enes anes vene vec eve e eee zere 3 6 3 2 5 Com Nearest Area Control Center ACC Frequencies 3 7 3 26 Com Nearest Flight Service Station FSS Frequencies 3 8 a2 Com Nearest Weather WX Frequencies s s s 3 9 NAV TE e e a nen ened 3 10 SS Recent Nav FrEQUON CIGS uu ana a anen nanes nanes reres emer e eee ee reres reres reres 3 10 3 542 Nav User Frequencies cccccccsscecssssssssessreessnsessseeeseesessnes 2 11 3 3 2 1 Viewing the Nav User FrEQUAN QY u aauuauu aaa nc aus ane zune vec nne enen LI 3 3 2 2 Deleting the Nav User Frequency s s s 3 11 3 3 2 3 Editing a Nav User Frequency au uuu auuaa un ann ana ann ene c ene eee eee ere eee 3 12 3 3 3 Nav Database Frequenci s c cccscsccccssscsecsessesssesesseeeeeeen 3 13 3 3 4 Nav Nearest U Ne e e eniranta 3 14 6 on 3 15 3 4 1 AGJUS INTE GOTA 3 15 3 4 2 T E E E E E E 3 16 3 4 3 e E 3 17 3 4 4 SC Ol OI se ceccee soccer ee ees cece seas cece eee 3 17 System COI UI AO rcs eee e EST Eai 3 18 al COM S DACI OJ cen ven n nsien hd edve hnd ms et t 2 18 3 02 Display Brightness se ia dhun n aha da e e 3 19 333 DIS OS E E E E viene A A E E 3 20 3 5 4 B A e E E E 3 20 3 5 5 LOA aD lS a szceaeeeneaentectexcaceeanseeseedexeachaseeesedateaesseatenatetesss 3 21 ob SON icedi 3 22 e ST ER EE EER E EERE 3 22 E E VE 3 23 3 6 1 Setting Up the Count Down TIMEN aaa aaa uau van can causa us
37. min hereby grants permission to download a single copy of this manual and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed for personal use provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited This part shall comply with Garmin Banned and Restricted Substances document 001 00211 00 Garmin is a registered trademarks of Garmin Ltd or its subsidiaries These trademarks may not be used without the express permission of Garmin November 2012 Printed in the U S A A GARMIN LIMITED WARRANTY All Garmin avionics products are warranted to be free from defects in materials or workmanship for two years from the date of purchase for new Remote Mount and Panel Mount products one year from the date of purchase for new portable products and any purchased newly overhauled products six months for newly overhauled products exchanged through a Garmin Authorized Service Center and 90 days for factory repaired or newly overhauled products exchanged at Garmin in lieu of repair Within the applicable period Garmin will at its sole option repair or replace any components that fail in normal use Such repairs or replacement will be made at no charge to the customer for parts or labor provided that the customer
38. mote Flight Service Station Unicom None Table 2 1 Com Frequency Type List 1 After making a selection press ENT 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 2 3 A GARMIN 2 2 4 Com Database Look Up 1 Press the CURSOR knob from the Com display to activate the Q database look up function Identifier Field Active for Selection Turn SMALL Knob m 1 23 450 cahi To Select Character Turn LARGE Knob To Move Cursor Figure 2 5 Database Identifier Active for Selection amp 2 Turn the SMALL knob to select characters and turn the LARGE COM ACTIVE ENTER IDEHTIFIER knob to move the cursor ACT 1 23 450 oe KPDE Selected Identifier COM ACTIVE PORTLAHMO IHTL Figure 2 6 Database Identifier Selection 3 After selecting the desired characters press ENT Turn the SMALL knob to scroll through the list of waypoint types Waypoint Types with a sign will have more frequencies for the same type After selection the selected waypoint and type will be remembered for 30 minutes 123 450 Mo HCT EHT TE WET EFD TYFE gail Turn the SMALL Knob To Select Frequency Type Figure 2 7 Database Waypoint Type Selection 4 Press ENT to copy the frequency into the Standby frequency location Press and release the FLIP FLOP key to swap the Active and Standby frequencies 2 2 5 Frequency Database Reverse Look Up The identifier and frequency type will be shown for Com and Nav frequencies
39. n the ON or Transmit position If the microphone is keyed for longer than 35 seconds the GNC 255 will return to the receive mode on the selected frequency A Stuck Mic message will display until the transmit key is released Alerts will display until the error clears or the user acknowledges it 2 2 8 Remote Frequency Selection Control On units configured for remote Com frequency Recall pressing the remote recall switch will load the next preset Com frequency into the units Standby frequency box The remote recall switch can be pressed multiple times to scroll the entire preset frequency list through the Standby frequency box the list will wrap from the bottom of the list back up to the top skipping any empty preset positions The standby frequency isn t activated until a Com FLIP FLOP switch either bezel mounted or remote COM RMT XFR is pressed Remote Frequency Selection only functions on units configured for a remote Com Frequency recall switch 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 2 5 A GARMIN 2 3 Nav Radio 2 3 1 Selecting a Nav Frequency The selection of Nav frequencies is the same as for the Com frequencies C N 1 Press the C N key to reach the Nav radio function The NAV annunciator on the top line of the display will show increments The MHz selection range is between 108 and 117 MHz in one MHz steps 3 Turn the SMALL knob to change the values in 50 kHz increments 4195 4
40. n today Have the serial number of your product handy and connect to the Garmin web site www garmin com or https fly garmin com fly garmin Look for the Product Registration link on the Home page Also be sure to record your serial number in the space provided If you have any questions the Garmin Product Support department may be reached Monday through Friday 7 00 AM to 7 00 PM Central Time US 913 397 8200 US Toll Free 1 866 739 5687 Canada Toll Free 1 866 429 9296 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide V A GARMIN Record of Revisions Part Number Revision Date Descriptin 190 01182 01 Initial release vi Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN Contents Product Registration and SUO DOI ansore ne cisarina V Gena SCAN nnp AEE T 1 1 E E e ao aea E E E E E E E E E E 1 1 AT R 1 2 1 2 1 Power Com Volume Squelch Knob cccccscscsesecessesseeeeeees 1 2 12 2 KEKA 1 2 1 23 Tuning LARGE SMALL Concentric Cursor Knobs 000 1 3 1 2 4 LO Gj E E E 1 3 1 2 5 So NG 1 3 1 2 6 ON casera eet cece eects ec eee eee 1 3 1 2 7 TTF VO on a A 1 3 1 2 8 CIR Cear KEY geni rn 1 3 1 2 9 ENT Enter GE 1 3 1210 FUNC FUNCION Koy e 1 4 loti MON Monitor Key au ua ua aa na aa ae nanen ae nenen eee ever enen eee eee vete naa 1 4 ko U e ee 1 4 2 Basic ODE ao se e eee 2 1 E EN seca 21 ST 2 1 221 Selecting a COM FreQUENCY au uaauuauuaana ane nu see eneve eee e eee eren eee 2 1
41. ntact dealer for service Verity glideslope deviation indications with another source and crosscheck final approach fix crossing altitude If another glideslope source is not available for verification tly a GPS based approach Contact dealer tor service Fly an approach that does not use the glideslope receiver VOR LOC GPS Contact dealer for service Re apply povver to the unit Verity the Push To Talk key switch is not stuck Contact dealer for service if this message persists 4 5 A GARMIN Message Description Action REMOTE KEY The remote com Verity the COM RMT XFR key STUCK transter COM RMT switch is not stuck Contact dealer Com remote XFR key switch has for service if this message persists transfer key is been in pressed stuck position for at least 30 seconds This input will now be ignored This input is not available in all installations REMOTE KEY The remote com Verity the COM CHAN UP key STUCK frequency increment switch is not stuck Contact dealer Com remote COM CHAN UP key for service if this message persists frequency switch has been in increment key is Pressed position for stuck at least 30 seconds This input will now be ignored This input is not available in all installations REMOTE KEY The remote com Verity the COM CHAN DN key STUCK frequency decrement switch is not stuck Contact dealer Com remote COM CHAN DN key for service if this message persists
42. played Value to the Previous Value Figure 3 28 Adjust the Intercom Values Turn the SMALL knob to set the value Then press the ENT Go 3 Turn the LARGE knob to select the ICS Squelch or Volume key to save the selected values 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 15 A GARMIN 3 4 2 Aux Audio The Aux function allows you to turn Aux Audio On Off and set the volume 1 Press FUNC to access the Functions Turn the LARGE knob to select the ICS Function Turn the SMALL knob to view the Aux Volume function Then press the ENT key LOM FREGUENCY LIST aa 18 250 HAY FREQUENCY LIST AU AUDIO SYS COMFIGURAT LOM Figure 3 29 Select the Aux Audio Function 2 Turn the SMALL knob to turn the Aux Audio On or Off 3 Turn the LARGE knob to select the Aux Volume Turn the SMALL knob to set the value Then press the ENT key Turn Small Knob To Turn Aux On Off Turn LARGE And Then SMALL Knob To Adjust Aux Volume Press the ENT Key to Save Press the CLR Key To Revert the Displayed Value to the Previous Value Figure 3 30 Adjust Aux Audio 4 Press the CLR key to revert to the previous Volume value and CLR then repeat step 3 to select a new value 3 16 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 3 4 3 Intercom On Off The Intercom On Off function toggles intercom on and off The intercom can also be toggled on off with a remote switch if installed The Intercom On Off f
43. quency 1 2 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 1 2 3 1 2 4 1 2 5 1 2 6 1 2 190 01182 01 Rev A Tuning LARGE SMALL Concentric Cursor Knobs The LARGE right and SMALL right knobs are used for tuning frequencies and data entry TUNE LARGE Outer Knob SMALL Inner Knob PUSH CRSR FLIP FLOP Key Press and release the FLIP FLOP key to switch between the active left most and standby right most frequency Switching between Com frequencies is disabled while you are transmitting C N Com Nav Key Press the C N key to select the Com or Nav VLOC radio mode OBS Key Press the OBS key to see the current OBS setting and graphic CDI The OBS page will be disabled if the unit is installed with an external converter T F To From Key Press the T F key to toggle between the bearing TO or radial FROM the active VOR The T F page also shows Distance Speed Time information The T F key does not operate for Localizer frequencies CLR Clear Key Pressing the CLR key erases information cancels entries and resets timers ENT Enter Key Press the ENT key to save selected values to confirm a prompt or to save the Standby frequency Garmin GNC 255A 255B Pilot s Guide 1 3 A GARMIN 1 2 10 FUNC Function Key The FUNC Function key accesses function categories for the following the Com Radio Nav Radio ICS Configuration System Configuration an
44. rcom On Off Speaker On Off SYS Config Com Spacing DSPL Brt DSPL Contrast Database Info Load Database Software Ver Serial Number Timers Count Down ENT Start Stop CLR Reset Push CRSR Settings ENT Accept Count Up ENT Start Stop CLR Reset Figure 3 1 Functions Diagram 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 1 A GARMIN 1 Press the FUNC key to access the Functions 2 Turn the LARGE knob to select the COM NAV ICS or SYS functions 3 Turn the SMALL knob to view the choices in each function ENT 4 Press the ENT key to access the function FA 5 Press the FUNC key again to exit Functions 3 2 Com Frequencies The Com Frequencies category in the Functions section contains recently used frequencies Recent user defined frequencies User and a database of all frequencies provided in the standard default memory Database 3 2 1 Recent Com Frequencies The last 20 Com frequencies used are kept in the list of Recent Com Frequencies and can be accessed in this function NOTE When switching from 8 33 kHz to 25 kHz mode any 8 33 kHz specific user frequencies will be deleted from the user frequency list This only affects the user frequencies within the 8 33 kHz spectrum 1 Press FUNC to access the Functions Turn the LARGE knob to select the Com Function Turn the SMALL knob to view the Recent frequency function Then press ENT 2 Turn the SMALL knob to select an Ent
45. ry 1 20 Turn SMALL Knob To Select Entry 118 250 DA a Selected Frequency Press ENT to Make the Selected Press lt gt To Make the Frequency the Standby Selected Frequency The Active Frequency Figure 3 2 Recent Com Frequencies 3 Press and release the FLIP FLOP key to transfer the displayed channel to the Active frequency position Press the ENT key to transfer the displayed channel to the Standby frequency position 3 2 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 3 2 2 Com User Frequencies Fifteen Com User Frequencies can be saved with an assigned waypoint WPT identifier and Type NOTE When switching from 8 33 kHz to 25 kHz mode any 8 33 kHz specific user frequencies will be deleted from the user frequency list This only affects the user frequencies within the 8 33 kHz spectrum 3 2 2 1 Viewing the Com User Frequency 1 Press FUNC to access the Functions Turn the LARGE knob to select the Com Frequency Function ACT l l 8 250 119 100 x Selected Frequency HIT EHTSSTE HFTKESLE TYFE THA Select Wot Type Select VVpt Name Figure 3 3 Vievving User Com Frequencies 2 Turn the SMALL knob to vievv the Com User frequency function Then press ENT Turn the SMALL knob to vievv the User Frequencies 3 Press and release the FLIP FLOP key to set the displayed frequency as the Active frequency 4 Press the ENT key to set the displayed trequency as the Standb
46. s brighter than normal and a value below zero means darker than normal The range can be adjusted by using the SMALL knob to adjust the value The GNC 255 will either control dimming based on the photocell or the lighting bus This is set in configuration mode during installation and is not selectable by the pilot 1 Press FUNC to access the Functions Turn the LARGE knob to select the SYS Function Turn the SMALL knob to view the Display Brightness function Then press the ENT key Current Display EMWT 00ME CLEZUHDN OFFSET Brightness ER I G GHTHESS 25S Press ENT to Accept Press CLR to Return Turn the SMALL Knob to the Selected Value to the Previous Value Select the Offset Value Figure 3 34 Set Display Brightness 2 Turn the SMALL knob to set the value Then press the ENT key 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 19 A GARMIN 3 5 3 Display Contrast The Display Contrast has a range from 50 Low Display Contrast and 50 High Display Contrast with 0 as the default The range can be adjusted by using the SMALL knob to adjust the value 1 Press FUNC to access the Functions Turn the LARGE knob to select the SYS Function Turn the SMALL knob to view the Display Contrast function Then press the ENT key 21900 E ENT ENHT OOHE LLUM Press ENT to Accept Press CLR to Return Turn the SMALL Knob to the Selected Value to the Previous Value Select the Offset Value Figure 3 3
47. s the Active frequency 4 Press the ENT key to set the displayed trequency as the Standby frequency 3 3 2 2 Deleting the Nav User Frequency CLR 1 While viewing a Nav User frequency press the CLR key to delete the displayed User frequency Press ENT Key To Confirm Deleting The Frequency Active Frequency ee Position In List Ota eens Turn SMALL Knob DELETE FREQUENCY ENT Ty CONFIRM To Select Entry Press ENT To Delete The Selected Frequency Selected Freg Figure 3 17 Deleting User Nav Frequencies 2 Press the ENT key to delete the displayed trequency 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 11 p y gt UU ENT 1 NO A GARMIN Editing a Nav User Frequency Press FUNC Turn the LARGE knob to reach the Nav functions and then turn the SMALL knob to select the Nav User Frequencies Press ENT 115 40 siete Ics CONF I GUR Aio iH SYS COMFIGURAT LOM Figure 3 18 Nav User Frequency Function Turn the SMALL knob to select the desired Nav User frequency and then press ENT Press the Cursor knob to enable editing The frequency MHz value will be selected Turn the SMALL knob to select the MHz trequency value Turn the LARGE knob to move the cursor and then turn the SMALL knob to select the kHz frequency value Turn the LARGE knob to select the WPT name Turn the SMALL knob to select characters and turn the LARGE knob to move the cursor EDIT UZER FREG 40 EHT D
48. ssing ENT twice will stop the displayed Timer ENT 3 24 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN When the Count Down Timer reaches 0 00 it will continue counting as a Count Up value The Count Down Timer that is counting up will be highlighted A Count Up Timer will continue counting separately AC 1 18 250 pa STE 132 990 Count Down Timer Value COM ACTIVE Highlighted When Counting Up Figure 3 48 Count Down Timer Value Now Counting Up 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 25 3 26 This page intentionally left blank Garmin GNC 255A 255B Pilot s Guide A GARMIN 190 01182 01 Rev A A GARMIN 4 APPENDIX 4 1 Troubleshooting If efforts to resolve the problem fail contact your dealer or the factory for technical assistance The Garmin customer service staff will gladly assist you Please have the following information ready e System configuration products antennas mounting locations etc e Model No part number and serial number e Software versions e Description of the problem e Efforts made to isolate solve the problem Garmin International Inc Aviation Products Customer Service Department 1200 East 151st Street Olathe KS 66062 3426 USA If you have any questions the Garmin AT Product Support department may be reached Monday through Friday 7 00 AM to 7 00 PM Central Time US 913 397 8200 US Toll Free 1 866 739 5687 Canada Toll Free 1 866 4
49. st VOR Frequencies 1 Press FUNC to access the Functions With the Nav Frequency Function highlighted turn the SMALL knob to view the Nav Q Nearest VOR function Then press ENT FUNC Q D Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN Q 2 Turn the SMALL knob to display the available VORS 3 Press the ENT key to accept the displayed VOR and set it as the Standby frequency Or press the CLR key to return to the CLR Functions display 3 4 ICS Configuration The Internal Communications System ICS Configuration allows you to adjust the intercom set the Nav Aux volume turn the Intercom On Off and turn the intercom speaker On Off 3 4 1 Adjust Intercom The Adjust Intercom function allows you to set values for the Intercom squelch and volume The Intercom On Off function must be set to On to make the Adjust Intercom function available 1 Press FUNC to access the Functions Turn the LARGE knob to select the ICS Function Turn the SMALL knob to view the Adjust Intercom function Then press the ENT key ENT sTs COHFIGURATIOH THR COHFIGURATIOH Figure 3 27 Select the Adjust Intercom Function Turn the SMALL knob to set the ICS Squelch value Then press the ENT key Turn Small Knob To Adjust Intercom Squelch ICS SQUELCH Turn LARGE And Then ENT D0ME LUN ICS VOLUME 385 SMALL Knob To Adjust Intercom Volume Press the ENT Key to Save Press the CLR Key To Revert the Dis
50. unction must be set to On to make the Adjust Intercom function available 1 Press FUNC to access the Functions Turn the LARGE knob to select the ICS Function Turn the SMALL knob to view the Intercom On Off function Then press the ENT key Turn SMALL Knob To Select On or Off ENT 1 18 250 IHTECOH QHJOFF ACT E IHTERCOM Mag EMT 00ME CLR UMDO Press ENT to Accept Press CLR to Return the Selected Value to the Default Value Figure 3 31 Turn the Intercom On Off 2 Turn the SMALL knob to set the Intercom On or Off Then press the ENT key to save the selected value 3 4 4 Speaker On Off The Speaker On Off function toggles speaker output on and off 1 Press FUNC to access the Functions Turn the LARGE knob to select the ICS Function Turn the SMALL knob to select the Speaker On Off function Then press ENT Turn SMALL Knob To Select On or Off 13 990 SPEAKER ONOFF ACT m SPEAKER lg EMT 00ME CLR UMDO Press ENT to Accept Press CLR to Return the Selected Value to the Default Value Figure 3 32 Turn the Speaker On Off 2 Turn the SMALL knob to set the speaker output On or Off Then press the ENT key to save the selected value ENT 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 17 A GARMIN 3 5 System Configuration The System Configuration function will show the Software Version Database Info and Serial Number as well as allowing you to set values for the Com spacing Displa
51. y frequency 3 2 2 2 Deleting the Com User Frequency CLR 1 Press the CLR key to delete this User frequency Press ENT Key To Delete Selected Freq Position In List Turn SMALL Knob To Select Entry Active Frequency Press ENT To Confirm Selected Frequency Deleting The Selected Freq Figure 3 4 Deleting User Com Frequencies 190 01182 01 Rev A Garmin GNC 255A 255B Pilot s Guide 3 3 A GARMIN 2 Press the ENT key to confirm deletion of the displayed frequency 3 2 2 3 Editing a Com User Frequency 1 Press FUNC Turn the LARGE knob to reach the Com functions and then turn the SMALL knob to select the Com User Frequencies Press ENT COMJUSER FREGQS Select User Freqs Nav FREGUENCY LIST ICs CONFIGURATION SYS COMFIGURAT LOM Figure 3 5 Com User Frequency Function frequency Turn the SMALL knob to select the MHz values and turn the LARGE knob to move the cursor and then the SMALL knob to select kHz values rh 24 550 Tk E 1 Select User Freq Value EMT ACCEPT CLR UNo0 HFT Q 2 Press the CRSR SMALL knob to start editing the Com User Figure 3 6 Com User Frequency Value Selection 3 Turn the LARGE knob to select the Wpt Name Turn the SMALL knob to select characters and turn the LARGE knob to move the cursor 124550 i2530 2 EMT ACCEPT CLR UMoo HFT KEOS Select User Wot Name Figure 3 7 Com User Frequency Name Selection 4 After selecting the desired characters press ENT 5
52. y Brightness and Display Contrast and use the Load Database feature to update databases 3 5 1 Com Spacing Com spacing may be selected between 8 33 kHz and 25 kHz to allow for regional requirements NOTE When switching from 8 33 kHz to 25 kHz mode any 8 33 kHz specific user frequencies will be deleted from the user frequency list This only affects the user frequencies within the 8 33 kHz spectrum 1 Press FUNC to access the Functions Turn the LARGE knob to select the SYS Function Turn the SMALL knob to view the Q Com spacing function Then press the ENT key Turn the SMALL Knob to ENT Select the Channel Spacing 1 18 750 COH SFAC IHG ACT m CHHL SPACE AEAN dsf EMT 00ME CLR UMDO Press ENT to Accept Press CLR to Return to the Selected Value the Previous Value Figure 3 33 Com Spacing Display 2 Turn the SMALL knob to set the Com spacing and then press the ENT key 3 18 Garmin GNC 255A 255B Pilot s Guide 190 01182 01 Rev A A GARMIN 3 5 2 Display Brightness As it arrives from the factory the GNC 255 automatically adjusts its display brightness for the current lighting conditions A small sensor on the display is used for this function A manual adjustment is available for controlling the brightness level of the display as an offset from the normal or zero position The limits of the adjustment range are 10 Low Display Intensity and 100 High Display Intensity A value above zero mean
Download Pdf Manuals
Related Search