Garmin GBR 21 GPS Receiver User Manual
Contents
1. owner s manual and reference guide GBR 21 beacon receiver 1993 2000 GARMIN Corporation GARMIN International Inc 1200 East 151st Street Olathe Kansas 66062 U S A Tel 913 397 8200 or 800 800 1020 Fax 913 397 8282 GARMIN Europe Ltd Unit 5 The Quadrangle Abbey Park Industrial Estate Romsey SO51 9AQ U K Tel 44 1794 519944 Fax 44 1794 519222 GARMIN Asia Corporation No 68 Jangshu 2nd Rd Shijr Taipei County Taiwan Tel 886 02 2642 8999 Fax 886 02 2642 9099 All rights reserved 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 prior written consent of GARMIN Corporation GARMIN Corporation hereby grants permission to download a single copy of 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 contains the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual is strictly prohibited Information in this manual is subject to change without notice GARMIN Corporation reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes Visit the GARMIN website for current updates and supplemental information conce2. INPUT OUTPUT FORMAT Data Transfer In NMEA Out In No Out No In NMEA Out No In No Out RTCM In NMEA Out RTCM In No Out autopilot or plotter are connected to the GPS unit they must be set to work with NMEA 0183 as well Note On some newer model Garmin GPS receivers you may set the interface to Garmin Revr There is also a scan option which will automatically scan for a DGPS frequency and bit rate Please refer to your GPS owner s manual for using this function If this setting is used you may skip step 4 From the Beacon Receiver Setup Page enter the Tuned To frequency and the Bit Rate for the nearest DGPS beacon transmitter Refer to the Beacon Reference Card for this information Once the frequency and bit rate have been en tered Tuning will be displayed at the bottom of the page If the beacon signal is received by the GBR 21 the SNR field will display a signal to noise ratio and Receiving will appear at the bottom of the page The SNR scale ranges from zero no recept ion to 30 best reception The LED status light on the receiver will change from flashing to constantly on indicating the signal is being received If the beacon signal is received but no DGPS correction data is included the message No Data will appear at the bottom of the page The LED status light on the receiver will continue to flash If no beacon signal is r
3. from broadcast site Wrong bit rate selected on GPS unit Wrong frequency selected on GPS unit GBR 21 not wired properly with GPS unit Check wiring Also refer to Troubleshooting problems 6 and 7 0103121721232831 The receiver status indication 3 No DGPS Position Not enough data is available to at the top left of the Satellite displayed on GPS unit compute a DGPS position Status Page will indicate 3D Please refer to Troubleshooting Diff or 2D Diff when problems 6 and 7 differential corrections are available A D appears at the bottom of the signal 4 No RTCM Input Beacon receiver is improperly strength bar for each satellite displayed on GPS unit connected or baud rates do not with a corresponding match differential correction Please refer to Troubleshooting problems 6 and 7 5 RTCM Input Intermittent connection between Failed displayed on 21 and GPS unit Check GPS unit wiring and or beacon antenna connections Interference from ship s electrical system thunderstorm activity or another source is preventing signal lock on Also refer to Troubleshooting problems 6 and 7 Reference Troubleshooting Problem Possible Cause Chart 6 GPS interface Wrong frequency or bit rate status screen displays selected on GPS unit No data or No Antenna coupler not securely Signal grounded Check ground strap RTCH HHE Beacon transmitter not Message transmittin
4. the DGPS system at your own risk To reduce this risk carefully review and understand all aspects of this Owners Manual and carefully compare indications from your GPS receiver to all available navigation sources including the information from other NAVAIDs visual sightings charts etc For safety always resolve any discrepancies before continuing navigation NOTE This device complies with Part 15 of the FCC rules 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 The GARMIN GBR 21 does not contain any user serviceable parts Repairs should only be made by an authorized GARMIN service center Unauthorized repairs or modifications could void your warranty and authority to operate this device under Part 15 regulations Introduction Table of Contents Introduction W Wantu 1 Cautions Table of Contents List of Figures Overview Capabilities Package Contents Installation Mounting the Receiver Mounting the Antenna Connecting GBR and GPS Operation Using the GBR 21 Reference DGPS How It Works Sources of Error Troubleshooting Chart GBR 21 Specifications Introduction List of Figures Installation Figure 1 Mounting the Receiver Figure 2 GBR 21 Cable Connections Screen Example GPS 12 12XL 48 Main Men
5. the distance to the satellite from the beacon site as measured by the GPS receiver and the actual distance to the satellite based on the known location of the beacon site These corrections are communicated to the users GPS set through the DGPS Beacon Station and the GBR 21 The users GPS set then uses the corrections to remove errors from its measurements Satellites received by the shipboard GPS receiver but not by the GPS receiver at the beacon transmitter site will not have corresponding corrections When three or more satellites received by the shipboard GPS receiver have correspond ing corrections the result is a highly accurate position reading The more satellites with corrections the more accurate the position DGPS BEACON SIGNAL IN GPS SIGNAL IN STANDARD ANTENNA GA 22 23 H FIELD GA 29 GPS COUPLER BEACON ANTENNA ANTENNA BEACON GPS RECEIVER RECEIVER CORRECTION DATA RTCM SC 104 Figure 5 Shipboard DGPS System The GBR 21 receives RTCM SC 104 format signals from ground based DGPS Beacon Stations operating in the 283 5 kHz to 325 0 kHz frequency band with MSK modulation and data rates of 25 50 100 or 200 bits per second These stations are typically operated by government agencies such as the U S Coast Guard Individual stations vary and the user may wish to verify the suitability of the signal for the intended application with the station operato
6. 18 Volt DC power source 6 Connect the BLACK wire from the power data cable to vessel ground or the negative terminal of the ship s 10 18 Volt DC power source 7 Installation Mounting the Antenna IHTERFHCE The Interface Setup Page may be selected from the Main Menu on the GPS 12 12XL 48 For additional instructions see the owner s manual for your GPS receiver INTERFACE ETCH HMER 0183 2 0 4300 haud BEACON FECUF FREG ___ _KH2 RATE 100bps DIST Sta SHR __dB Ho Status From the Interface Page select RICM NMEA and NMEA 0183 2 0 to properly communicate with the GBR 21 Mounting the Antenna The supplied antenna coupler fits a standard 1 inch antenna mount not included Like the receiver the antenna should be placed away from all sources of interference As a general rule mount the antenna at least three feet from all other antennas and the vessel electrical system components alternator ignition system Position the antenna so that the clearest view in all directions is obtained The antenna coupler is supplied with 30 feet of RG58 cable attached When routing the cable to the GBR 21 observe the same precautions followed when choosing mounting locations for the receiver and the antenna Avoid routing the cable near the vessel alternator or ignition system components A ground strap is attached to the antenna coupler except on the GA 22 23 H field antennas For proper op
7. 7 Too far from DGPS transmiter or not tuned to closest station 18 Physical Size Weight Power Voltage Current Drain Signal Processing Frequency Range Minimum Signal Acquisition Time Data Processing Demodulation MSK Bit Rates Interfaces Input Input Sentences Output Output Sentence Antenna Coupler Diameter Height Reference 5 2 Lx3 6 Wx1 5 H 132mm x 91mm x 38mm 6 8 ounces 0 193 kg GBR 21 Specifications 10 18 volts DC using supplied power data cable 130 mA 283 5 325 0 kHz 10 uV 15 seconds MSK Minimum Shift Keying 25 50 100 200 bps RS 232 or NMEA 0183 4800 or 9600 baud jumper selectable Binary Magnavox PSLIB Starlink RS 232 4800 or 9600 baud jumper selectable RTCM SC 104 6 of 8 bit format 1 6 41mm base 6 15mm top 4 8 122mm without antenna 16 8 427mm with antenna Reference 5 7 antenna CPE 226 6 8 B Baud Tallinn 9 Deacon hog Pago nonsed s Adda aaa 12 DEACON RAP oue codeine teni odit 15 BEACON 13 14 Beacon Receiver Setup Page 11 12 Deacon SIQI OIL u INI TS 14 15 BEACON rans mitte estrada 13 14 C C pil ceased ananas 5 Calloni 2 COMP AGI reina 5 Connections WIES ii oet 9 11 Contents Para 5 D DGPS System 13 14 E Error SOULCES ON enc tite cdm an 5e 15 16 F S iii 12 d G 8 I Insta
8. EAVE THESE UNCONNECTED FOR 4800 BAUD UNITS WITH PO 10 18 VDC 4 PIN ROUND PLUG Power Data Cable 1 RED POWER INPUT 1 RED 10 18 VDC GBR 21 Power Data Cable el GBR 21 Power Data Cable GBR 21 Power Data Cable GBR 21 Power Data Cable 2 BLACK GROUND 2 BLACK GROUND 3 BROWN DATA OUT 3 BLUE DATA OUT 10 4 WHITE DATA IN 4 BROWN DATA IN 5 WHITE BAUD SELECT IN 6 GREEN BAUD SELECT OUT 7 YELLOW JUMPER THESE TOGETHER FOR 9600 BAUD LEAVE THESE UNCONNECTED FOR 4800 BAUD Figure 3 Sample Wiring to GARMIN GPS Units gt Operation Using the GBR 21 UNITS WITH i 18 PIN PLUG GBR 21 Power Data Cable Power Dota Cable 15 RED POWER INPUT 1 RED 10 18 VDC 1 18 BLACK GROUND 2 BLACK GROUND 17 BLUE DATA OUT 3 BLUE DATA OUT 16 BROWN DATA IN 4 BROWN DATA IN 11 YELLOW ALARM c 5 WHITE BAUD SELECT IN 1 10 12 14 NOT USED lO GREEN BAUD SELECT OUT 7 YELLOW GROUND JUMPER THESE TOGETHER FOR 9600 BAUD LEAVE THESE UNCONNECTED FOR 4800 BAUD UNITS WITH 4 PIN RECTANGLE PLUG GBR 21 Data Cable 1 RED 10 18 VDC Power Data Cable 4 BLACK GROUND 2 BLACK GROUND 3 WHITE DATA OUT 3 BLUE DATA OUT ojo o of 2 GREEN DATA IN 4 BROWN DATA IN 5 WHITE BAUD SELECT IN Notused 2 3 4 6 GRE
9. EN BAUD SELECT OUT e YELLOW JUMPER THESE TOGETHER FOR 9600 BAUD LEAVE THESE UNCONNECTED FOR 4800 BAUD Figure 3 cont Sample Wiring to GARMIN GPS Units Using the GBR 21 When using the GBR 21 all tuning operation functions are controlled by the GPS unit Your GARMIN GPS unit provides a Beacon Receiver Setup Page and in some cases Beacon Log Page for this purpose The operating instructions provided below are generalized to cover several different GARMIN models For additional information on operating your GPS unit with the GBR 21 refer to the owners manual for your GPS unit 1 Turn the power on to the GBR 21 The LED status light will flash indicating power has been applied but no beacon signal is being received 2 Turn the GPS unit on 3 From the Interface Setup Page select an RTCM input If a baud rate selection is also provided specity 4800 or 9600 baud as appropriate On GARMIN GPS units RTCM input NMEA 0183 output should be selected The baud rate will be set to 4800 If additional devices such as an 11 Operation Using the GBR 21 MAIN MENU Hearest Waypoints Proximity Waypoints Create Waypoint Waypoints Routes Track Trip amp Fuel Planning System Setup Havigation Setup Timers amp Alarms Input Output The Main Menu Page on the GPSMAP 130 135 175 180 185 230 235 Select Input Output to make the desired interface settings INPUT OUTPUT
10. NS MAY NOT APPLY TO YOU To obtain warranty service call the GARMIN Customer Service department 913 397 8200 for a returned merchandise authorization number The unit should be securely packaged with the tracking number clearly marked on the outside of the package and sent freight prepaid and insured to a GARMIN warranty service station A copy of the original sales receipt is required as the proof of purchase for warranty repairs GARMIN retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase price at its sole discretion SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY Introduction Cautions All differential beacon receivers decode correction data determined at the beacon transmitter site via a GPS receiver s The GPS system is operated by the government of the United States which is solely responsible for their accuracy and maintenance The DGPS beacon transmitters are operated by the U S Coast Guard or similar govern ment agency in other countries which is responsible for their accuracy and maintenance The Global Positioning System and the Differential Global Positioning System are under development and are subject to changes which could affect accuracy and performance of all DGPS equipment Although a DGPS system is a precision electronic NAVigation AID NAVAID any NAVAID can be misused or misinter preted and therefore become unsafe Use
11. able operation for 4800 or 9600 baud e Accuracy Improves position accuracy of GPS unit to better than 10 meters 2 drms Package Contents Your GARMIN GBR 21 package includes GBR 21 unit Power Data Cable Antenna coupler w 30 cable amp whip antenna or GA 22 23 H field beacon antenna w 30 cable Owners Manual Beacon Reference Card This package provides the materials required to permanently install the GBR 21 and connect it to your GARMIN GPS unit In addition to supplying power to the GBR 21 the power data cable is used to interface the GBR 21 to the GPS unit The receiver may be powered by an external 10 18 VDC power source Power to the receiver should be controlled by an on off switch not included such as an accessory switch on the control console Overview Capabilities amp Package Contents The GBR 21 may be used with a variety of GARMIN GPS receivers The list below identifies most but not all compatible models If your GPS receiver is not listed you may check with your GARMIN dealer or contact GARMIN product support at 1 800 800 1020 to verify compatibility GPS 1 11 11 111 111 Pilot GPS eMap eTrex NavTalk GPS StreetPilot ColorMap GPS 12 12XL 12CX 12Map GPS 38 40 GPS 45 45XL 48 GPS 50 75 5 65 GPS 89 90 92 95 GPS 120 125 GPSCOM 170 190 GPSMAP 130 135 180 185 GPSMAP 162 168 GPSMAP 175 195 295 GPSMAP 210 220 215 225 230 235 Instal
12. eceived the SNR field will remain blank No Status will appear at the bottom of the page and the LED status light will continue to flash To select another beacon transmitter enter a new From the Input Output frequency and bit rate Settings Page select RTCM i i In NMEA Out to properly 8 Some Garmin units have a list of the last five interface with the GBR 21 beacon frequencies used on the Beacon Log Page As an alternative to reentering frequency and bit rate information each time you use the GBR 21 you may select a beacon from this list NOTE The Beacon Receiver Setup Page will 12 Reference automatically default to the last beacon transmitter used each time the GPS unit is turned on 9 Select the Satellite Bar Graph Page A D will appear at the bottom of the signal strength bar for each satellite with a corresponding differen tial correction or 3D Differential will be DGPS How It Works INPUT OUTPUT displayed at the top of the satellite page This INPUT OUTPUT FORMAT page is useful for determining the quality of RTCM In NMEA Out differential coverage available Remember the more satellites with corresponding differential corrections the more accurate your position will be 100 bps R TUNE TO DGPS How It Works Differential GPS DGPS is a technique used to improve the accuracy of the Global Positioning System No Status DGPS reduces the effects o
13. eration the ground strap must be connected to a vessel earth ground Do not ground the coupler to the electrical system If the coupler is not adequately grounded the beacon signal may be too weak for the GBR 21 to provide reliable correction data Note The GA 22 23 H field antennas do not require grounding 1 Secure the antenna mount at the desired mounting location 2 Thread the antenna coupler GA 23 onto the antenna mount and hand tighten until snug Do not over tighten Thread whip antenna onto coupler 3 Connect the antenna coupler s ground strap to a vessel earth ground A ground connection can usually be made by connecting to a thru hull fitting engine block dynaplate or body of a metal vehicle 4 Route the antenna cable to the GBR 21 Excess cable should be coiled together and secured in an inconspicuous location Modifications to the DGPS antenna cable could result in undesired operation of the GBR 21 5 Connect the antenna cable to the BNC connector on the GBR 21 Connecting the GBR 21 To Your GPS Unit The final step in installing the GBR 21 is to connect the receivers DATA IN DATA OUT and GROUND Return lines to your GPS unit The GBR 21 is designed to transmit receive data at 4800 or 9600 baud bits per second The receiver defaults to 4800 baud which is suitable for use with all GARMIN GPS receivers The 9600 baud option is provided to allow the receiver to be used with some newer models and other man
14. est DGPS beacon site This information is automatically transferred to the GBR 21 Installation Connecting GBR and GPS UNITS WITH 7 PIN PLUG Power Doto Coble a 10 18 VDC RED POWER INPUT 1 RED 10 18 VDC 2 3 BLACK GROUND BLUE DATA OUT 2 BLACK GROUND 3 BLUE DATA OUT 4 5 6 4 BROWN DATA IN 5 WHITE BAUD SELECT IN 6 GREEN BAUD SELECT OUT BROWN DATA IN WHITE NOT USED GREEN NOT USED 7 UNITS WITH 13 PIN PLUG Power Data Cable Q 7 YELLOW GROUND YELLOW ALARM e Pa JUMPER THESE TOGETHER FOR 9600 BAUD LEAVE THESE UNCONNECTED FOR 4800 BAUD 10 18 VDC RED POWER INPUT RED 10 18 VDC BLACK GROUND 2 BLACK GROUND 4 5 BLUE DATA OUT BLUE DATA OUT BROWN DATA IN 3 4 BROWN DATA IN 6 O 0 O 0 UNITS WITH 6 PIN PLUG Power Data Cable ER RED POWER INPUT 10 e 3 7 13 NOT USED YELLOW ALARM WHITE BAUD SELECT IN GREEN BAUD SELECT OUT 5 6 1 YELLOW JUMPER THESE TOGETHER FOR 9600 BAUD LEAVE THESE UNCONNECTED FOR 4800 BAUD 10 18 VDC RED 10 18 VDC 20 BLACK GROUND BLACK GROUND BLUE ALARM 30 BROWN DATA OUT BLUE DATA OUT BROWN DATA IN WHITE DATA IN RED BLK NOT USED WHITE BAUD SELECT IN 6 GREEN BAUD SELECT OUT JUMPER THESE TOGETHER FOR 9600 BAUD L
15. f Selective Availability SA SMN o ionospheric variations and can improve position accuracy to better than 10 meters k BIT RATE After entering the beacon s operating frequency set the bit rate as indicated on the Beacon Reference Card Beacon information is also available from the other sources listed on the card o GPS RECEIVER STATION AND DGPS TRANSMITTER SHIPBOARD GPS AND DGPS RECEIVERS Figure 4 The DGPS System Xx SS h n B Q Os i C Na E 7 o E A DGPS system consists of the following e DGPS Beacon Transmitter and GPS Receiver at a known location Shipboard DGPS Beacon Receiver Shipboard GPS Receiver DGPS capable e GPS Satellites 13 Reference DGPS How It Works Main Menu Waypoints Cities Hearest Routes Track Logs Trip Computer The Main Menu Page on the GPS 12 Navtalk Select Setup to make the desired interface settings sosition Interface RTCHITEXt Text Out From the Interface Page select RT CM NMEA to properly interface with the GBR 21 14 The DGPS Beacon Transmitter is placed at a known location i e the exact position of the site has been previously determined At the beacon transmitter site the GPS satellites are monitored using a GPS receiver This receiver is equipped to calculate corrections for each satellite received The correction is the difference between
16. feet away from the source of interference will solve the problem When a suitable configuration is found a permanent installation should be made Mounting the Receiver The GBR 21 may be mounted on any flat surface Select the mounting location according to your preferences either an out of the way location such as under the dash or at an accessible location where the LED status light will be visible Keep in mind that from this mounting location cables will be routed to the antenna and to the GPS unit 1 Drill the mounting holes 4 for the GBR 21 according to the mounting hardware that will be used Mounting hardware is not included with the GBR 21 You should select the mounting hardware suitable for your installation Stainless steel 4 or 6 diameter hardware is recommended A mounting template is provided inside the back cover of this manual 2 Mount the GBR 21 at this location using the selected hardware 3 Connect the power data cable to the GBR 21 observing the proper polarity as indicated by the notch in the connector BNC Connector Power Data Connector N Alignment Notch Figure 2 GBR 21 Cable Connections 4 Connect the RED wire from the power data cable to an accessory switch on the dash If an accessory switch is not available a standard SPST switch may be used not included 5 Connect the other end of the accessory switch to the ship s positive 10
17. g by using an EMI RFI filter and by mounting the beacon receiver s antenna away from these sources of interference Reference Sources of Error Sosition Interface Format RTCH HMEA Boud Rate 4800 Beacon Bit Rate 322 0 DU Status Tuning SHR Distance li E d After entering the beacon s operating frequency set the bit rate as indicated on the Beacon Reference Card Beacon information is also available from the other sources listed on the card Beacon Log The Beacon Log Page lists the last five beacon frequencies used As an alternative to retyping the frequency and bit rate each time you may select beacon from this list 15 Reference Sources of Error Multipath Multipath error occurs when the GPS signal is reflected before it reaches the GPS receiver The reflected signal takes slightly longer to reach the GPS receiver than a non reflected signal This added time delay results in position error The distance to each satellite is calculated based upon the time it takes the GPS signal to reach the GPS receiver Multipath error can be minimized by mounting the GPS antenna at a location which minimizes the potential for reflected signals Generally the GPS antenna should be mounted on a large flat horizontal surface and away from any vertical structure cabin walls large mast etc which could reflect the GPS signal Number of Satellites Visible As previously
18. g correction data Ho Differential 7 GPS interf GBR 21 Sd lun CPS Position interface not wired properly wit status screen displays GPS unit Check wiring None No Status power to GBR 21 See or Check Wiring Troubleshooting problem 1 Problem with DGPS antenna grounding or damage to Acknowledge If the No Differential GPS ui qe Baud rates do not match osition message is displayed on your GPS receiver Beacon transmitter out of range correction data may not be Try a different station available This may be due to a missing or weak beacon signal 8 Beacon signal weak Antenna coupler not securely not enough GPS satellites or or not received grounded Check ground strap bad wiring connection between Interference from ship s the GBR 21 and GPS electrical system thunderstorm activity or another source is Em Interface inhibiting signal lock on IRTCH HME Also refer to Troubleshooting Baud Rate problems 6 and 7 4300 EBEN Bit Rate 9 Accuracy not as oor sate ite geometry ESE 7 200 expected coverage exists Status Interference to GPS antenna Ho Status and or beacon antenna exists i pistones Portable antenna being used mmm umm E noe on GPS unit Use remote If either No Status None or antenna Check Wiring messages Multipath signals being appear depending upon model received by GPS unit of GPS see Troubleshooting problem number
19. lation Mounting the Receiver Mounting the Receiver Please read through these instructions thoroughly before attempting installation Make sure you completely understand these instructions before you begin When in doubt seek professional assistance The receiver may be mounted at a remote location under the dash or behind a panel However you may wish to mount the receiver at a location that allows easy viewing of the LED status light for immediate indication of receiver status The following items are required to complete the installation of your GBR 21 Antenna mount standard 1 inch 14 threads per inch e Hardware to secure the GBR 21 On off switch to control power to the GBR 21 It is recommended that the system be temporarily hooked up with the wiring and unit placement approximating the desired final installation Then check operation with potential local interfering equipment turned on and off For example other electronic equipment fan motors engine ignition alternators or generators can be sources of interference INSTALLATION NOTES Recommended Screw Bolt Diameter 4 or 6 Material Stainless Steel Length Select per your installation Locknuts or lockwashers are recommended Hardware shown is forexample purposes only Figure 1 Mounting the Receiver Installation If a problem is found try altering the location of the unit or wiring Often moving the antenna a few
20. llation AMA adas 8 Installation Receiver darte 6 7 nterface Setup Page 11 12 20 IL IL NES uu asawa dario 8 L LED Status atole 12 LED Stats np DE xe tote ue LI M Mounting Template scatta 2 Mounting the Arteria uo eot 8 Mounting the Receiver 6 O LA EMO gaan nats cite 11 12 P Package sicari J Power Data Cable id s Power data Cable uuu uu noa asnasqa 7 9 R RTCM SC 104 format 14 S Satellite Bar Graph isse 13 SOUTCES Ol Ei 15 16 y eres ocius 19 T Table ol Gonnet ri 3 Template Mo nt ig u tette pera 21 Troubleshooting adds 17 18 W Warranty Information 1 Witting las 10 WING CODD COOfIs sos ela 9 11 Template Mounting Template NOTES Maximum Hole Diameter 0 145 3 68mm Select fastener type length per your installation 4 752 120 70mm 3 359 85 30mm 21 ili GARMIN 1993 2000 GARMIN Corporation E GARMIN International Inc 1200 East 151st Street Olathe Kansas 66062 U S A GARMIN Europe Ltd Unit 5 The Quadrangle Abbey Park Industrial Estate Romsey SO51 9AQ U K GARMIN Asia Corporation No 68 Jangshu 2nd Rd Shijr Taipei County Taiwan www garmin com Part Number 190 00069 00 Rev C
21. r The station power is normally set to provide a usable range somewhere near 300 km Other factors such as local interference lightning time of day and season and if the path to the station is over ground or water and antenna selection or installation affect the usable signal range Sources of Error Using a DGPS Beacon Receiver with your existing GPS Receiver can provide substantial improvements in accuracy however there may be occasions when the best possible accuracy will not occur Several factors which you should be aware of can contribute to a degraded DGPS accuracy Loss of DGPS Beacon Signal Obviously the lack of DGPS correction data will result in reduced accuracy Accuracy will be the same as if no beacon receiver was being used Several conditions can cause a loss of the beacon signal Poor data or ground connections between receiver and the GPS receiver can result in intermittent or nonexistent correction data The range of a DGPS beacon transmitter see the accompanying Beacon Reference Card is typically a few hundred miles or less Beyond this range the beacon signal cannot be reliably received Interference to the beacon signal can be experi enced during periods of thunderstorm activity Other sources of static interference such as alternator motors and ignition systems can also affect signal reception Alternator ignition interference can be minimized through proper shielding of the ships wirin
22. rning the use and operation of this and other GARMIN products Website address www garmin com GARMIN and GBR 21 are registered trademarks of GARMIN Corporation and may not be used without the express permission of GARMIN Corporation January 2000 Part Number 190 00069 00 Rev C Printed in Taiwan Introduction Limited Warranty GARMIN Corporation warrants this product to be free from delects in materials and workmanship for one year from the date of purchase GARMIN will at its sole option repair or replace any components which fail in normal use Such repairs or replacement will be made at no charge to the customer for parts or labor The customer is however responsible for any transportation costs This warranty does not cover failures due to abuse misuse accident or unauthorized alteration or repairs THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY LIABILITY ARISING UNDER WAR RANTY 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 FOR ANY INCIDENTAL SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES WHETHER RESULTING FROM THE USE MISUSE OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT SOME STATES DO NOT ALLOW THE EXCLUSIONS OF INCIDENTAL OR CONSEQUEN TIAL DAMAGES SO THE ABOVE LIMITATIO
23. stated the number of satellites available can affect position accuracy To apply the corrections provided for the satellites received at the beacon transmitter station the same satellites at least in part must be received by your GPS receiver And certainly if there arent enough satellites to determine a GPS position there arent enough satellites to calculate a DGPS position Satellite Geometry A minimum of 4 satellites are required to determine a 3D position At times additional satellites are required due to their placement with respect to each other This relative placement is referred to as satellite geometry Ideal satellite geometry exists when the satellites are located at wide angles with respect to each other When satellites are located in a line satellite geometry is considered poor This same requirement applies to DGPS If corrections are available for four different satellites but they are all located in the same general area or in a line the DGPS corrections will be minimal However if the same four satellites are placed farther apart in several very different directions from our position the corrections will have a much greater effect and the position accuracy will be greatly improved Reference Troubleshooting Chart Problem Possible Cause 1 Receiver will not Power switch wiring faulty power on No LED Fuse breaker blown if used 2 LED status light RTCM data not being received flashing
24. u Screen Example GPS 12 12XL 48 Input Output Settings Screen Example GPS 12 12XL 48 Beacon Receiver Setup Page 9 Figure 3 Sample Wiring Diagram for GARMIN GPS units 10 11 Operation Screen Example GPSMAP Fixed Mount Main Menu Screen Example GPSMAP Fixed Mount Input Output Page Reference Figure 4 The DGPS System Screen Example GPSMAP Fixed Mount Beacon Settings Figure 5 Shipboard DGPS System Screen Example GPS Handheld Main Menu Screen Example GPS Handheld Interface Settings Screen Example GPS Handheld Beacon Settings Screen Example GPS Handheld Beacon Log Page Screen Example Satellite Status Page Screen Example No Differential Position Error Mounting Template Screen examples apply to models 130 135 175 180 185 230 235 Screen examples apply to models ITI III 12Map NavTalk Capabilities The GBR 21 offers a host of powerful capabilities to enhance the performance and accuracy of your GARMIN GPS receiver e Performance Single channel operation provides high sensitivity manual tuning throughout the beacon broadcast band e Ease of Use Operation is controlled using the Beacon Receiver Setup and Beacon Log pages on your GPS unit Convenience May be remotely mounted in an out of the way location Receiver status informa tion is displayed directly on the GPS unit Low Power Consumption Draws approxi mately 130 milliamps during normal operation e Interfaces User select
25. ufacturers GPS units Two ground wires are provided on the power data cable For reliable communication it is essential that the GBR 21 and the GPS unit share the same ground This ground connection acts as the current Return line You may connect either the YELLOW wire or the BLACK wire from the power data cable to the ground wire of the GPS unit NOTE Some non GARMIN GPS units may have a separate data line labeled RETURN DATA GROUND or DATA If one of these lines exist connect the YELLOW wire from the power data cable to it 1 Connect the BLUE wire from the GBR 21 s power data cable to the DATA INPUT line of the GPS unit 2 Connect the BROWN wire from the power data cable to the DATA OUTPUT line of the GPS unit 3 Connect the YELLOW or BLACK wire trom the power data cable to the GROUND wire of the GPS unit If the BLACK wire is already connected to the Same ground terminal as the GPS unit no additional connection is required unless a separate RETURN line is provided by the GPS unit 4 19600 baud operation is required connect the WHITE and GREEN power data cable wires together For 4800 baud operation default leave these wires disconnected Installation Connecting GBR and GPS INTERFACE ETCH HHEA HMER 0183 2 0 4300 baud EERCOH RECUR FRES 304 kHz 100bps Tuning Use the Beacon Receiver Setup Page to enter the beacon operating frequency and bit rate for the near
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