AT Pro International Manual
Contents
1. OL MO i 1 z 4 IRON PINPOINT ELIM y 1 AUDIO Freq Adj Iron Disc E r Battery Level Pushbutton PINPOINT M Use or to change Iron Audio Indicator iron discrimination Use to hear a level discriminated Frequency Adjust Pushbutton Press and hold to ON OFF Power hold 1 second pinpoint or use with D iron Pushbutton Press and hold for fast auto ground balance or use with NOTCH DISC or for manual ground balance GROUND BALANCE to turn power on off SENSITIVITY MODE push quickly to toggle or to change i frequency between detection modes q y RESET hold 5 seconds to restore ELIM and NOTCH DISC factory settings Pushbuttons SENSITIVITY Use NOTCH DISC or to select Pushbutton a cursor Then use ELIM button to set increases or decreases sensitivity S discrimination on or off 4 Garrett Metal Detectors QUICK START GUIDE 1 Install batteries The AT Pro operates with four 4 AA batteries which are already installed by Garrett 2 Power ON Press and release the ON OFF Power button The AT Pro powers on in the last mode used and is ready to search Factory default mode is Coins 3 Select Mode FT Use the Mode Pushbutton to select a different detection mode when desired 4 Adjust settings Adjust Sensitivity or Discrimination settings if desired 5 Begin scanning Lower the searchcoi2. X A fono INTE FUNA TIONAL er s Manual THANK YOU FOR CHOOSING GARRETT METAL DETECTORS Congratulations on the purchase of your new Garrett AT Pro metal detector This enhanced metal detector has been specifically designed for use in Europe s challenging environments The AT Pro includes Garrett s exclusive Target ID technology and patented discrimination features Two indicator scales allow you to see the detector s discrimination setting Lower Scale as well as the analysis of each target Upper Scale In addition a Digital Target ID scale provides a more specific target value The AT Pro also features High Resolution Iron Discrimination 40 points for separating desirable targets from iron junk in cluttered areas several advanced audio features and a standard 28x22cm elliptical Double D searchcoil engineered for optimum performance in Europe s more challenging mineralised soils In addition the AT Pro can be operated in a very user friendly Standard STD Mode or in a more advanced PRO Mode for experienced hunters Backed by more than 45 years of extensive research and development your Garrett AT Pro metal detector is the most advanced of its kind in the industry Whether you are experienced or a beginner this machine is well suited for a wide variety of detecting environments The AT Pro s advanced features are designed for the expert treasure hunter but its Standard Mode can be easily operated by the beginner I
3. chart on the following page provides Digital Target ID ranges of some commonly found items It is important to note that while operating in the PRO Mode the Pro Audio depth can exceed Target ID depth i e faint targets at depth can be heard without providing any Target ID 20 Garrett Metal Detectors Medium Coins y EN Bronze Gold Silver Small Coins Large Coins Bronze Gold Bronze Gold Silver Small Hammered Jewelry ilver Coins Pull 0 10 20 30 40 50 60 70 80 90 99 Note Target values can vary based on the orientation of the target in the ground amount of ground mineralization etc It is important to practice in the field to learn how these factors can affect Target ID TONE ID The Tone ID feature produces three distinct audible tones based on a target s metal type and conductivity Low Tone Ferrous targets such as nails iron steel etc Medium Tone Small thin targets that are non ferrous such as small jewelry foil and some very thin hammered coins High Bell Tone Non ferrous targets with medium to high conductivity including most coins and jewelry Note PRO Mode produces a high tone STD Mode produces a bell tone AT Pro International 21 DISCRIMINATION Notch Discrimination The AT Pro s NOTCH DISC pushbuttons are used in conjunction with the ELIM pushbutton to eliminate trash objects from detection such as foil or pull tabs SENSITIVITY GARRETT Manual j
4. g thick silver will indicate at the right Target ID Cursor Upper Scale The Target ID cursor in conjunction with the Target ID Legend indicates the probable identity of a detected target The upper scale consists of twenty 20 graphic segments for Target ID Lower Scale The lower scale or Notch Discrimination Scale continually indicates the discrimination pattern The AT Pro will produce an audible target response for the pixels that are switched on and no audible response for those that have been switched off The Target ID Cursor will always indicate all targets The discrimination pattern can be adjusted as described in the Discrimination section AT Pro InternationalTM 19 DIGITAL TARGET ID FERROUS NON FERROUS CIL SILVER inp ion I mm GOLD I1 Digital a gt T ursor ID The AT Pro s Digital Target ID system provides a specific target value to help identify targets more precisely Targets are identified on the LCD by number with items near 1 being the most ferrous The most conductive targets Such as thick silver register closer to to 99 The Digital Target ID is a more precise version of the Target ID Cursor shown in the Upper Scale Each Target ID Cursor has a width of 5 digital points For example a Digital Target ID of 73 will light the cursor from 70 to 75 This system when used in conjunction with the audio target signals provides you with more information The sample
5. has the additional benefit of faster recovery time for separating adjacent targets AT Pro International 15 Audio Target Response Comparison Standard vs Pro Mode Standard Binary Audio Mode em Pss Pro Audio Mode og rennene Vannene Shallow coin Deep coin Notice the differences in Standard binary audio versus PRO audio in the two target scenarios above The binary audio gives a solid consistent beep for both the shallow and the deep coin In contrast PRO Mode s proportional audio provides a stronger signal for the shallow coin and a softer signal for the deeper coin The actual profile or signature of the target s response is heard thereby providing more information 16 Garrett Metal Detectors Adjacent Targets Comparison Standard vs Pro Mode Standard Binary Audio Mode FIO SEE t pane eiit Mode Adjacent targets 9 These two adjacent coins would produce one strong signal while in STD Mode In PRO Mode the proportional audio provides two peaks of audio response to allow the user to identify multiple targets AT Pro International 17 Tone Roll Audio Pro Mode This feature of Pro Mode provides the user with more audible target information to help identify targets particularly flat iron objects such as bottle caps and washers Standard Mode audio produces a single tone based upon the target s strongest signal For flat iron objects this single tone is often the same as a good target T
6. j j G B yy m NTEANA TONAL Pe IRON PINPOINT ND BAL AUDIO Freq Ad or NOTCH DISC ELIM Pushbutton Pushbutton RON DISC The AT Pro has 12 pixels or notches of discrimination in addition to the 40 points of High Res Iron Discrimination Any combination of these pixels can be switched on or off based upon your preference There are two primary methods for modifying the Notch Discrimination Pattern to reject a specific type of trash or unwanted item The first method uses the NOTCH DISC and ELIM pushbuttons seen above to manually modify the Lower Scale s Notch Discrimination pattern Use the or NOTCH DISC pushbuttons to move the Target ID cursor to the left or right Next press the ELIM pushbutton to eliminate or activate the pixel located on the Lower Scale directly below the Target ID cursor See illustrations on next page 22 Garrett Metal Detectors Example Manual Modification of Notch Discrimination Pattern FERROUS NON FERROUS FOR SILVER l ion re GOLD mtl SOLD I Use the NOTCH DISC buttons to position the Target ID Cursor above the pixel you wish to eliminate see above illustration Use the ELIM pushbutton to delete this pixel from the Lower Scale see below This item is now rejected FERROUS HON FERROUS P SILVER urovnat er DOS TRON DES md 7 CON COINS p DEPTH 20cm ZERD 254 The second method of modifying the Notch Discrimination
7. notching out this pixel detection of some small jewelry items will be reduced Tips for locating targets amongst terra cotta hot rocks Magnetic minerals such as hot rocks and terra cotta can mask the presence of good targets In order to detect a good target first ground balance the AT Pro to the terra cotta or hot rocks that are present Be aware however that the combined Target ID might be very low e g a bronze coin and terra cotta together may register between 10 and 15 on the Digital Target ID Therefore Iron Discrimination levels must be reduced in order to ensure detection of good targets covered by the terra cotta The Iron Audio feature can also be used so that all targets above the point of discrimination produce either a medium or high tone i e good targets 42 Garrett Metal Detectors Isolating adjacent targets The narrow detection field of the AT Pro s DD searchcoil allows better separation of adjacent targets versus a similar size concentric searchcoll Use narrow swings of the searchcoil in trashy areas to isolate good targets amongst the trash Concentric 1 Searchcoil e Swing your searchcoil parallel to plow lines and the water s edge This will minimize the negative effects caused by uneven ground in plowed fields and varying amounts of moisture near the water Do not swing the searchcoil perpendicular to plow lines and the water s edge as this may produce abrupt changes in ground response that can red
8. pattern involves the use of only the ELIM pushbutton When an unwanted target is audibly detected while hunting simply push the ELIM button to create a notch at that Target ID Cursor The next time the AT Pro encounters the same trash item it will not produce an audible signal The AT Pro s ELIM pushbutton can also be used to find specific metal items For example if an earring has been lost scan the matching earring with the AT Pro while in the ZERO mode Note where the Target ID cursor appears when the earring is scanned Next use the NOTCH DISC and ELIM pushbuttons to switch off all the pixels except the one for the earring Note Depending upon how the lost earring is laying in the ground its Target ID may shift a little therefore your ability to find it will be enhanced by turning on an additional pixel AT Pro International 23 on either side The AT Pro is now programmed to find the missing earring based on the conductivity of its matching pair Note The notch discrimination function can be used to modify each Mode s discrimination pattern Notch Discrimination modifications made while in CUSTOM either in Standard or Pro mode will be retained when the detector is switched OFF However all changes made to the Notch Discrimination pattern while in ZERO or COINS modes will return to the factory settings when the detector is switched OFF and back ON again Iron Discrimination The AT Pro features a high resolution iron di
9. small targets or balance slightly negative to reduce detection of hot rocks terra cotta and saltwater Press and release the GND BAL pushbutton and continually bounce pump the searchcoil from 2 to 20 cm above the ground If low tones are produced increase the Ground Balance setting using the NOTCH DISC pushbutton If high tones are produced decrease the setting using the NOTCH DISC pushbutton Press and release the or NOTCH DISC pushbuttons to make single step adjustments or press and hold to make large adjustments Continue bouncing the coil and making adjustments until a minimum audio response is obtained indicating the detector is ground balanced The Ground Balance setting will be indicated on the LCD Press and release the GND BAL pushbutton again to exit Manual Ground Balance mode The Ground Balance setting will be retained when the detector is switched OFF Typical Ground Balance Ranges 80 99 Highly ferrous magnetite ferrous oxide minerals black sands hot rocks terra cotta 60 80 Moderately mineralized soils red clay brown clay iron bearing clay minerals etc 20 60 Likely an iron object 0 20 Highly conductive non ferrous minerals such as saltwater 32 Garrett Metal Detectors FREQUENCY ADJUSTMENT FERROUS NON FERROUS yu SILVER BLU s GOLD In 25 an DE ae e man AT o 9 kam Elim OND oa DAL Wo aN et RON Freq Adj A PINPOIINT SENSITIVITY o N i Pushbutton eed aca Pushb
10. the ground can mask good targets and even create ghost signals that appear to be a good target Garrett s selectable Iron Audio feature allows the user to hear discriminated iron normally silenced in order to know the whole picture and avoid being tricked into digging an undesired target Iron Audio also allows adjustment of the mid tone s range to include all targets above the iron discrimination setting The user is adjusting the cut off between low tone iron targets and mid tone targets to better distinguish good targets AT Pro InternationalTM 27 Refer to the illustrations below regarding the use of the Iron Audio feature Low Tone Mid Tone High Tone 0 a IRON AUDIO OFF Normal division of low mid and high tones Silent Low Tone Mid Tone High Tone I P0 nn IRON pu OFF With the Iron Discrimination set to 20 all targets below 20 are silent Low Tone lt Mid Tone gt High Tone F P0 NENNNEEEEEEN 00 AUDIO ON Targets below 20 are now heard as a low tone and targets above 20 will produce a mid or high tone When Iron Audio is on in the PRO Mode iron target will not only be heard but they will produce an even more distinctive response with multiple tones For example a nail will produce several fast low tones as the searchcoil passes over A flat 28 Garrett Metal Detectors iron object like a bottle cap or steel washer will produce a very distinctive
11. 0 days The AT Pro is a rugged machine designed for outdoor use in all environments However as with all electronic equipment there are some simple ways to care for the detector to maintain its high performance e Avoid extreme temperatures as much as possible such as storing the detector in an automobile trunk during the summer or outdoors in sub freezing weather Keep the detector clean Wipe the control housing with a damp cloth when necessary e Disassemble the stem and wipe it and the searchcoil clean with a damp cloth e When storing for longer than one month remove the batteries from the detector e t is best to use quality alkaline batteries When changing batteries be sure to replace with all new batteries for optimum performance Replace protective cover on the connector when not using headphones AT Pro International 49 TROUBLESHOOTING GUIDE SOLUTION 1 Ensure batteries are installed in the correct position 2 Replace all old batteries with all new batteries SYMPTOM No power Erratic sounds or target ID cursor movement Intermittent Signals I m not finding specific targets Target ID Cursor bounces 1 Ensure your searchcoil is securely connected and the coil cable is snugly wound around the stem 2 If using the detector indoors be aware that excessive amounts of electrical interference exists plus excessive amounts of metal can be found in floors and walls 3 Determine i
12. Low High Low response Tip for using Iron Audio In areas with high concentrations of iron it is recommended to switch off Iron Audio Otherwise it may produce far too many signals Then if a target is detected that has a questionable or inconsistent response switch on Iron Audio to check if it is iron To fully appreciate the additional information offered by the Iron Audio feature conduct the following experiment Start with the AT Pro in Standard STD Zero Mode and pass the searchcoil over a bottle cap which is lying flat on the ground Note that the target response is consistent with the audio of a good target Then switch the detector into PRO Zero Mode and pass the searchcoil over the bottle cap again Note the subtle low tones at the beginning and end of the target response indicating a questionable target that might be made of iron Finally set IRON DISC to 35 switch on lron Audio and pass the coil completely over this target again The distinctive Low High Low response now indicates a target that is unmistakably iron AT Pro International 29 SENSITIVITY FERROUS Sela E nil GOLD TYM SENSITIVITY Sensitivity Pushbutton Indicator The AT Pro has eight 8 settings for sensitivity Use the r SENSITIVITY buttons to step through the eight levels which are continuously shown on the LCD Use higher sensitivity levels when searching for very small or very deep targets Use lower sensitivity levels in loca
13. TECTING GUIDE Highlights include Hundreds of full color photographs 5 5 x 8 5 size 324 pages soft cover Part No 1562100 Field tips from dozens of European metal detectorists European Metal Detecting Guide TECHNIOUES TIPS AND TREASURES Explanation of detector and Eo ae Cris searchcoil technology VEE Illustrations of proper detector KEE technigues k wi fedis European treasure laws information D NX ir WS otn Ideal reading for new detectorists P P NS dnb ky cludes Advice From Dozens of m cen pean ek L STEPHEN L MOORE AT Pro InternationalTM Sees 57 European Metal Detecting Guide Preview of Pages Dozens of pages of full color treasure photos with descriptions of the items age or value Photo exposes from the field such as this French rally experience gt Proper basic search techniques with illustrations TO VIEW OTHER RAM BOOKS Go to www garrett com and visit the Hobby Division An order form is available on our site which can be printed and mailed with your requested titles and payment 58 Garrett Metal Detectors GARRETT METAL DETECTORS www garrett com 1881 W State Street Garland Texas 75042 Toll Free 800 527 4011 Tel 972 494 6151 Fax 972 494 1881 Email sales garrett com 2010 Garrett Electronics Inc PN 1533300 B 1210 TM 60 Garrett Metal D
14. atic Ground Balance sees 31 Manual Ground Balance esses enne nenne 32 FREQUENCY ADJUSTMENT esccseeisQdektxshufadzkenc eiii etie 33 PIN POU TIN G necem nadto tui ucsateti OERE 34 Narrowing the Detection Area een 36 Coin Depth Indicator 1 cceeeee eec cerc nenene rennen 36 Alternative Pinpointing Methods een 37 HUNTING UP ZR 39 PENCH TE av 44 UNDERWATER OPERATION o eee eee nnn 47 CARE AND MAINTENANCE eee eee eee nene ee ant nene 48 Battery Replacement sessenta e 48 TROUBLESHOOTING GUDE sm me cinccavsnussamacnsueiansnnicanevenviscteectinutanwtacis 50 METAL DETECTING CODE OF ETHICS eee 51 MINN 52 WARRANTY SER VICE uden ole 53 ME Eee 54 SUGGESTED READING s ni Hamd n da 56 2 Garrett Metal Detectors AT Pro International M 3 AT Pro CONTROL PANEL Target ID Legend indicates Lower Scale metaltypes Digital Target ID indicates notch Target ID Cursor discrimination pattern High Resolution also shows indicates Iron Discrimination ground balance probable Coin Depth settings while in target identity GND BAL mode Indicator indicates depth of coin sized target indicates level of iron discrimination selected Mane UTC NON FERROUS Indicator Fo SILVER st IRON 11 tl GOLD iM nk DN Ir COIN Sem nj DEPTH 20cm Sensitivity Setting PP pil SENSITIVITY i GDC Fj P
15. e of detector problems 2 Contacted your dealer for help particularly if you are not familiar with the AT Pro detector In the event that repairs or warranty service are necessary for your AT Pro contact the local retail outlet where your detector was purchased To avoid excessive shipping and import charges do not attempt to return a Garrett product to the factory in the United States Information on international warranty repair needs can be found on the Garrett website www garrett com Click on the Hobby Division and then the Technical Support page for more details AT Pro International 53 28 cm DD Searchcoil Cover Protect the searchcoil s surface from scratching and chipping during use 11 5cm Super Sniper Searchcoil Part No 2222500 Use when searching for small shallow targets or in trashy or tight places Garrett PRO POINTER Pinpointing Detector 23 cm PROformance Concentric Searchcoil Part No 1166000 Part No 2222600 Smaller and lighter than the AT Pro s standard DD coil this waterproof searchcoil offers excellent depth for medium sized targets in less mineralized soils a TL GA RRETT PRU FM T EH The PRO POINTER combines performance with sleek design to assist in pinpointing hard to find targets Includes proportional audio vibration pulse rate target indicators and 360 side scan detection area Water resistant with LED light for low light uses Includes woven be
16. edure can be used to better understand how to set discrimination levels and the AT Pro s advanced audio characteristics Begin by testing the iron nail in the STD and PRO Modes with the ZERO discrimination pattern Listen to the Low Tone sound an iron object creates and note the Digital Target ID number it produces If the iron nail registers up to a 26 on the Digital Target ID use the IRON DISC pushbuttons to move the Iron Discrimination setting up to 26 Pass the iron nail across the searchcoil again to verify that it has been eliminated If not raise the Iron Discrimination setting a little higher using the IRON DISC touchpad until the iron target no longer produces an audible response Next press the IRON AUDIO pushbutton and pass the iron nail across the searchcoil again Test this target both in STD and PRO Modes with the Iron Audio feature switched on Iron Audio bench test Flat iron objects like bottle caps or steel washers can appear to be good conductive targets to detectors operating in the standard mode To better understand the benefits of Iron Audio use a bottle cap to test the AT Pro s advanced audio features First set the detector to Standard Mode with Zero discrimination and pass the bottle cap across the searchcoil AT Pro International 45 at a distance of 8 to 10 cm Note that the bottle cap s flat surface gives a Digital Target ID reading in the 75 85 range and produces the high tone of a good target Nex
17. etectors
18. f you are close to other metal detectors or other metal structures such as electrical power lines wire fences benches etc 4 Adjust frequency 5 Reduce your sensitivity setting Intermittent signals typically mean you ve found a deeply buried target or one that is positioned at a difficult angle for your detector to read Scan from different directions to help define the signal In the case of multiple targets switch to the ZERO Mode or press the pinpoint button to precisely locate all targets In trashy areas use the Super Sniper searchcoil NOTE Iron targets may cause Intermittent Signals You can identify iron targets in ZERO Mode or with the Iron Audio feature Ensure you are using the correct mode for the type hunting you are doing If specifically hunting for coins COINS mode should be your best choice to eliminate other undesirable targets You may also use the ZERO mode which detects all metal targets to ensure desired targets are detected If your Target ID Cursor bounces erratically chances are you ve found an iron target However a Target ID Cursor may bounce if a good target such as a coin is not parallel to the searchcoil e g on edge It may also bounce if there is one or multiple junk targets laying next to the good target Scan from different directions until your Target ID Cursor becomes more stable NOTE Large flat pieces of iron depending on their orientation in the ground can read as a
19. good target or can cause erratic Target ID Cursor movement Use Iron Audio feature to help identify iron targets 50 Garrett Metal Detectors METAL DETECTING CODE OF ETHICS The following is a Code of Ethics that many treasure hunt clubs endorse and hobbyists follow to preserve our exciting hobby of metal detecting We encourage you to do the same will respect private and public property all historical and archaeological sites and will do no metal detecting on these lands without proper permission will keep informed on and obey all local and national European legislation relating to the discovery and reporting of found treasures will aid law enforcement officials whenever possible will cause no willful damage to property of any kind including fences signs and buildings will always fill the holes dig will not destroy property buildings or the remains of deserted structures will not leave litter or other discarded junk items lying around will carry all rubbish and dug targets with me when I leave each search area will observe the Golden Rule using good outdoor manners and conducting myself at all times in a manner which will add to the stature and public image of all people engaged in the field of metal detection AT Pro InternationalTM 51 CAUTIONS When searching for treasure with your Garrett detector observe these precautions Never trespass or hunt on pr
20. hnique that works best for you As you improve your pinpointing accuracy you will dig smaller holes and increase your productive hunting time 38 Garrett Metal Detectors HUNTING TIPS Begin hunting in STD Mode then switch to PRO Mode after you have become more experienced If you are new to metal detecting start searching in areas with sandy and loose soil to make it easier to learn how to use your metal detector pinpoint and dig targets Keep your searchcoil at a constant height of 2 to 3 cm above and parallel to the ground at all times for best detection results Do not lift or tilt the coil at the end of swings 4 CORRECT INCORRECT SWING X AT Pro International 39 e Walk slowly as you scan your searchcoil in a straight line from side to side at a speed of about 1 meter per second Advance the searchcoil about half the length of the searchcoil at the end of each sweep Overlap Swing by 14 cm 1m sec Overlap Swing by 14 cm In order to fully search an area overlap the swings of your searchcoil by half the length of the coil about 14 cm Sweep the searchcoil in a straight line or with a slight arc at a sweep speed of about 1m sec Tips for saltwater use Hunting in a saltwater environment is challenging for any Continous Wave VLF metal detector Saltwater is conductive and produces signals similar to foil Although the AT Pro is not specifically designed for saltwater use it can be used in this e
21. ifficult to precisely locate the target s center To help pinpoint the detector can be retuned to the target to narrow the detection field as follows While holding down the Pinpoint pushbutton move the coil toward the target until the LCD just reaches a full scale response Then quickly release and depress the Pinpoint button again to retune the detector and narrow its detection field Continue moving the searchcoil toward the target to find its central peak response If needed repeat the retune process to further narrow the target s response A quality hand held pinpointer such as Garrett s Pro Pointer is a recommended accessory item to speed the target recovery process and to aid in locating secondary targets Coin Depth Indicator The depth of a coin or similar sized target is indicated in 5cm increments Note targets larger than a coin may display shallower than actual depth while targets smaller than a coin may display deeper than actual depth 36 Garrett Metal Detectors Alternative pinpointing technique DD tip or tail In the standard pinpointing method described on pages 34 the target is pinpointed beneath the center of the searchcoil Some detectorists using DD coils prefer to pinpoint off the tip or tail of the searchcoil DD tip pinpointing technique Press and hold the Pinpoint pushbutton and sweep the searchcoil side to side to center the target the point where the strongest audio response is heard and the ma
22. ivate property without permission Avoid areas where pipelines or electric lines may be buried e National and state parks monuments etc are absolutely off limits Deepseeking detectors can detect concealed pipes wiring and other potentially dangerous material When those are located the proper authorities should be notified e Do not hunt in a military zone where bombs or other explosives may be buried e Do not disturb any pipeline particularly if it could be carrying flammable gas or liquid Use reasonable caution in digging toward any target particularly in areas where you are uncertain of the ground conditions f you are unsure about using your metal detector in any area always seek permission from the proper authorities 52 Garrett Metal Detectors WARRANTY amp SERVICE Your AT Pro detector is warranted for 24 months limited parts and labor but does not cover damage caused by alteration modification neglect accident or misuse Use of the AT Pro at submerged depths exceeding 3 meters will void this warranty In the event you encounter problems with your AT Pro detector please read through this Owner s Manual carefully to ensure the detector is not inoperable due to misadjustments Press and hold the power pushbutton for 5 seconds to return to the factory settings You should also make certain you have 1 Checked your batteries switches and connectors Weak batteries are the most common caus
23. l to 2 to 3 cm above the ground and scan the coil left and right at approximately 1m second AT Pro International M 5 AT Pro COMPONENTS 6 Garrett Metal Detectors Detector Stand Control Housing LCD Screen Pushbutton Controls Padded Arm Cuff LIST OF PARTS No tools are reguired to assemble the AT Pro Four 4 AA batteries are included with the detector The box for your detector contains the following parts One 1 control housing with One 1 28x22 cm DD S shaped stem searchcoil One 1 upper stem and one Owner s manual 1 lower stem connected Q Warranty Card One 1 wing nut two 2 Headphones mounting washers and one 1 threaded bolt If any part is missing please contact your local dealer AT Pro International 7 5 Depress the spring clip in the lower stem and adjust to ASSEMBLY p Pb J the most comfortable operating length 1 Align the holes in the mounting washers with the small posts on the lower stem and press firmly into place 6 Wrap the cable snugly about the stem with the first turn of the cable over the stem f Insert the coil connector into the 4 pin connector of 2 Slide the searchcoil onto the stem the control housing and hand tighten 3 Insert the threaded bolt through the holes of the lower stem and searchcoil Hand tighten the searchcoil assembly with the wing nut 8 If needed adjust the arm cuff by removing the sc
24. lt holster and 9 volt battery 30 5 cm PROformance Concentric Searchcoil Part No 2222700 To see Garrett s complete collection of metal detector accessories please visit www garrett com and view products within our Hobby This larger size concentric searchcoil is waterproof and offers excellent depth for larger targets in less mineralized soils Division Additional searchcoils recovery tools headphones carrying bags searchcoil covers Garrett caps and Garrett shirts are available for all detecting accessory needs Waterproof Headphones Part No 2202100 Required when the entire headphone set will be immersed in water 54 Garrett Metal Detectors AT Pro International 55 SUGGESTED READING Also available pocket size treasure hunting field guides written by Charles Garrett Collect them all This edition includes the author s personal INTRODUCTION TO experiences of hunting in Europe plus tips METAL DETECTING and techniques 76 pages PN 1546200 IN EUROPE pri S TAM S T ET OST OST TREASURE CHARLES BRETT TREASURE SIGNS AND SYMBOLS Available in English language only Visit RAM Books on www garrett com for future releases 56 Garrett Metal Detectors RAM BOOKS TITLES RAM Books a division of Garrett Metal Detectors publishes new titles each year related to treasure hunting gold pros pecting coin hunting and relic recovery Suggested EUROPEAN METAL Reading DE
25. n order to take full advantage of the special features and functions of the AT Pro you are urged to carefully read this instruction manual in its entirety AT Pro International M 1 TABLE OF CONTENTS Al PRO CONTROL PNL 4 QUICK START GUID E ve as usa 5 AT PRO COMPONENTS a ideou N EE 6 LISTOF PARTS Giada O O NU Sl MucU Mod nunE T Se 8 POWER G T San 11 SEARGF MODE Ss n ae NAS i EENDE 12 Overview of STD Mode vs PRO Mode eere 12 Standard STD Detection MoOdeES lt lt lt sessssrrz 13 PRO Detection Modes arunranaannnnanannnnnannnnnnnnnuunnnnnnuunennnnuunevnnnnunene 15 Proportional Audio PRO Mode esee 15 Tone Roll Audio PRO Mode eeeeeerrrnenenen n 18 TARGET ID INFORMATION nooo eee onen een nee on nee 19 DIGITAL TARGET IDi mumeennnnunrnennnnnnnnnnnnnenennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnvnnnnnnnnnne 20 TONE ID m P 21 DISCRIMINATION 5 siasisunt sn nisu M auRrI ka nlcidapaD cua asud S Gti Dent tut xaHu itin Ga ca us 22 Notch DISCmmAUO ose dnou Eve ua iru ti niil 22 Iron DiscrimiriatiOr iussuccsc vui cov svuc avena abEC Sw ed bida ciCG rd daa ei c2S KA 24 IRON E BpIO E 27 SENN EEE 30 GROUND BALANCE iscsssacunsivsnmbiaincsensuantenniiaiipisaunasnddupapbasoaudaniemieaeiasunacs 31 Autom
26. nal When pinpointing the Upper Scale on the LCD Screen indicates signal strength When the greatest number of LCD segments increasing left to right are shown the center of the searchcoil is directly over the target with the depth of a coin sized target shown on the depth scale The symbol PP for pinpoint is displayed on the LCD while pinpointing It is recommended to practice pinpointing in a test plot Note The center of detection is under the center of the coil just ahead of its stem mount The opening Indicates inpointin just ahead of the stem pine 6 center of the mount can serve as 28 x 22 cm DD searchcoil your reference point for pinpointing 34 Garrett Metal Detectors Coin Depth Upper Scale indicates l Indicator signal strength FERROUS NON FERROUS FO SILVER GOLD L anl ion Ios ma HI GOLD I ck CUS 10cm VV Men J 15cm COIN DEPTH Zot SENSITIVITY Nor ICH Dis SC V GARRETT Manusi MA 10 i FITTE FSLLT POLE Ho pet AUDIO L Freq Adj PINPOINT Pushbutton Press and hold to pinpoint Traditional pinpointing technique using Pinpoint pushbutton Note For best pinpointing results maintain a constant height above the ground e g 2cm and ensure that the detector is properly ground balanced AT Pro International 35 Tip for narrowing the detection area Large targets can produce wide signals while pinpointing making it d
27. nes These can be used for searching along waterways but may not be submerged For submersion optional waterproof headphones available from Garrett must be used Waterproof headphones sold separately must be used if the AT Pro is fully immersed in water The standard land use headphones included with the detector are not waterproof AT Pro InternationalTM 47 CARE AND MAINTENANCE NON FERROUS SILVER ull GOLD nich o 1 mam 5cm 10cm COIN B DEPTH 20cm Battery Level Indicator Battery Replacement The AT Pro is operating with fresh or fully charged batteries when 4 illuminated bars on the Battery Level Indicator see above are displayed The detector will maintain full performance until the batteries need to be replaced Replace batteries when there is only Remove the battery cover by rotating the cover one quarter turn in a counterclockwise direction Grasp the cap by top and bottom and pull it straight back Slide the battery tray out to replace the batteries INSERT BATTERY HOLDER IN THIS POLARITY 48 Garrett Metal Detectors one segment remaining NiMH rechargeable batteries may be used Expect 20 to 40 hours of operation depending on battery type and quality Access and replace the batteries by rotating the battery cover housing one quarter turn counterclockwise Pull and remove the cap to slide battery holder out Remove batteries when the AT Pro will be stored for longer than 3
28. nvironment Proper ground balance is the most important step for stable saltwater operation To achieve stable operation First Ground Balance the detector to the area that will be hunted see pages 31 32 Saltwater beaches typically Ground Balance between O and 20 f necessary reduce the Sensitivity until the signals become stable e Swing the searchcoil flat and at a constant height Do not bounce the coil or lift the coil at end of swings e Swing the searchcoil parallel to the water s edge 40 Garrett Metal Detectors AT Pro International 41 The detector will be less stable in shallow breaking surf where the searchcoil is in and out of the saltwater In this area the detector is encountering a constantly changing environment produced by the surf making it difficult for the detector to stabilize To improve stability negatively bias the ground balance by several points To do so simply press and release the Ground Balance button and use the NOTCH DISC pushbutton to manually reduce the ground balance setting For example if the Ground Balance number was 11 reduce the Ground Balance number to 7 or 8 Introduce only enough negative bias to achive sufficiently stable operation Reduce the detector s Sensitivity as needed Note While some background chatter may remain the more definitive response of a target can be recognized f necessary notch out the first pixel under Foil It is important to note that by
29. off The factory preset for the CUSTOM Mode is the same as the ZERO Mode see previous page Begin with this discrimination pattern and then use IRON DISC and NOTCH DISC pushbuttons to customize the discrimination settings Note Changes made to the ZERO or COINS modes will not be retained after the detector is switched off For information on the use of IRON DISC and NOTCH DISC see pages 22 20 14 Garrett Metal Detectors Zero Coins or Custom have the same discrimination patterns as in STD Mode In PRO Mode however the AT Pro utilizes its Pro Audio functions including Proportional Audio and Tone Roll Audio to offer more target information The Pro Mode audio provides more target information and faster recovery speed for separating adjacent targets This is especially important in areas where good targets may be scattered amongst iron trash Pro Mode audio by its nature creates more audible chatter than Standard Mode This is normal because of the additional sensitivity of Pro Mode The audio depth can exceed Target ID depth in Pro Mode so it is possible to hear deep targets that do not register a Target ID Proportional Audio Pro Mode Proportional audio response means that the loudness of the target s response is proportional to a target s signal strength This allows the user to hear subtle changes in a targets response Proportional audio response also allows the user to better judge a target s size shape and depth and
30. onal 25 Example Detecting Targets in Trash with High Res Iron Discrimination FERROUS NON FERROUS POIL SILVER val SOR in iso TT eta 7 E MODE COINS ARGEI ID _ EN ZERO L T rama 25 In the illustration above the AT Pro is operating with an IRON DISC setting of 20 The nail seen in Illustration 1 on page 25 registers from 10 to 25 on the Digital Target ID scale To eliminate the nail from detection increase the iron discrimination level to 25 using the IRON DISC pushbutton FERROUS NON FERROUS y SILVER BULL GOLD Its 70 In Illustration 2 the same iron nail is laying above a good coin target Since the Iron discrimination level is set to 25 the nail by itself would not be detected however the two objects have a combined conductivity of more than 25 Therefore the good target is detected due to the combined conductivity being higher than that of the discriminated target nail alone 26 Garrett Metal Detectors IRON AUDIO FERROUS 11 IRON 11 Iron Audio ON IRON AUDIO Pushbutton fs MODE RON PINPOINT Hold wor AUDIO L Freg Adj Press and release the IRON AUDIO pushbutton to switch the Iron Audio feature ON OFF When this feature is on the words IRON AUDIO appear on the LCD as shown in the illustration above The Iron Audio feature can be used in any of the AT Pro s six modes Scattered iron objects in
31. one Roll Audio however provides a variance of target tones as the searchcoil approaches and passes over the target These varying tones of audio provide better overall target information and identification Tone ID Comparison Standard vs Pro Mode High i High Tone Standard Binary Tone Audio Mode High SEN t Tone Tone ques 52 Pro Audio Tone Tone Mode i a Fo y AA i ry AER AAA Bottle cap om While in STD Mode bottle caps steel washers and other flat iron objects often sound like good targets producing a high tone response This is because the bottle cap s shape and flat surface resembles a coin which can trick the detector In PRO Mode however the bottle cap will produce a very distinctive response with multiple tones As shown the bottle cap will produce a distinctive response of Low High Low as compared to the coin s response of only High tone 18 Garrett Metal Detectors TARGET ID INFORMATION Target ID Legend Target ID Cursor Discrimination MX Upper Scale Pattern Lower Scale FERROUS NON FERROUS tt IRON Ihe i au ETT Oem d JU Sem COIN MODE Nm 5 DEPTH ZERO 25 Target ID Legend Works in conjunction with the Target ID Cursor to indicate a targets probable identity Ferrous iron targets will indicate on the left half non ferrous targets that are thin or have low conductivity will indicate in the middle and thick or high conductivity targets e
32. provided by the Pro Modes Tap the Mode button to scroll through the six modes the modes are Custom Coins or Zero in the STD Mode and Custom Coins or Zero in the PRO Mode Overview of STD Mode vs PRO Mode In its Standard STD Mode the AT Pro provides a full strength audio response regardless of a target s amplitude Many detectorists prefer this consistent unambiguous binary either on or off target response The AT Pro s Standard Mode operates in this clean binary response format in which the targets dominant conductivity is reported by a single tone This mode offers quieter or more stable operation and is preferred by many beginners For those who want to hear more target information Garrett offers a Pro Mode The benefits of operating in Pro Mode include the ability to hear a target s size and depth via the Proportional Audio and conductivity changes via Tone Roll Audio Pro Mode also offers faster recovery speed for separating adjacent targets The advanced audio features of Pro Mode are intended for more skilled users who wish to hear the true signature of targets versus the simpler target response provided in STD Mode 12 Garrett Metal Detectors In the STD modes the AT Pro produces a full strength binary audio beep to indicate a detected target Standard detection mode operation is ideal for learning the AT Pro because of its consistent audio signals Detected targets are heard at the same full strength beep regardle
33. rew on the bottom and moving it to the other hole 4 Depress the spring clip in the S stem and insert the control housing into the upper stem 8 Garrett Metal Detectors AT Pro International 9 9 If desired attach headphones to the 2 pin connector of the Control Housing Note Headphones are not required but are desired by many hunters to hear faint targets Connecting the headphones will silence the detector s speaker Note The provided headphones are for dry use only see page 54 for optional waterproof headphones 10 Garrett Metal Detectors POWERING ON FERROUS NON FERROUS FOR SILVER np firoNf 11 m l GOLD Ipex y 40 50 60 70 80 90 IRON AUDIO ON OFF Power and MODE Pushbutton Switch the detector on with the power button Press and release to switch the unit ON and resume hunting with the same settings used prior to switching the unit OFF To turn off the detector press and hold this pushbutton for one 1 second until the detector produces a second beep To restore the factory settings press and hold the power button for 5 to 10 seconds until the detector produces a fast double beep AT Pro International 11 SEARCH MODES The AT Pro includes six detection modes three Standard STD Modes and three Professional PRO Modes It is recommended to begin searching with one of the Standard Modes to become familiar with the AT Pro before switching to the more advanced audio features
34. scrimination adjustment This additional resolution allows more precise control of how much iron discrimination can be applied The level can be adjusted from O no iron discrimination to 40 maximum iron discrimination FERROUS ip ion Los High Resolution Iron Discrimination Setting IRON DISC Pushbutton Use the or IRON DISC pushbuttons to adjust the Iron Discrimination up or down The small two digit number GARRETT l above the words IRON DISC AA fro on the LCD indicates the iron discrimination setting 24 Garrett Metal Detectors The examples shown below illustrate how an iron object can often mask out the signal of an adjacent good target when too much iron discrimination has been applied Using the AT Pro s High Res Iron Discrimination apply just enough iron discrimination to reject the undesired iron nail shown in this example By using only a minimal amount of iron discrimination the detector will detect the combined conductivity of the coin and nail together thus overcoming the potential masking problem Iron targets such as the nail shown in Illustration 1 can sometimes mask a good target s signal If too much iron discrimination is applied the good target seen in Illustration 2 can be missed Read page 26 to learn how to apply the proper amount of iron discrimination to eliminate the nail shown in Illustration 1 and still detect the good target shown in Illustration 2 AT Pro Internati
35. ss of their size or depth Three discrimination patterns are available in the Standard Mode Zero Coins or Custom Note These three discrimination patterns are the same in either Standard or Pro modes ZERO Mode FERROUS W NON FERROUS m jiRON I vi IRON DISC CoN MODE mM Ea 20cm ZERO 254 Designed to detect every type of metal use ZERO mode to find all metal items or when the material of the desired object is unknown AII 12 discrimination pixels are switched on and High Res Iron Discrimination is set to O zero indicating that no metal targets have been eliminated Switch to the ZERO Mode to aid in locating a target when its signal is inconsistent Such signals could mean the target is made of iron or a trash target is close to a good target AT Pro International 13 COINS Mode FERROUS NON FERROUS FOU SILVER n ion Ii GOLD STD MODE COINS ZERO Designed to find most types of coins jewelry etc while eliminating trash items such as iron and foil High Res Iron Discrimination level has been preset to 35 to exclude most iron targets In addition one pixel of foil has been excluded Be aware that most pulltabs and pieces of tabs have not be eliminated from detection as these trash items have conductivities similar to small coins and jewelry e CUSTOM Mode This mode can be customized by the operator and the AT Pro will retain the changes when the detector is switched
36. t switch to PRO Mode and pass the bottle cap across the coil again and notice the different audio The clean sound heard in STD has been replaced with a mixed chirping tone that has subtle low tones at the beginning and end indicating a possible junk target Pass a conductive coin sized target across the coil and note its clean high tone in comparison to that of the bottle cap Finally remain in PRO Mode and set IRON DISC to 35 and switch on the Iron Audio feature Pass the bottle cap completely across the coil again and note the high tone chirp that is flanked by distinctive low tones on either side Again use a conductive coin sized target to compare its signature to that of a bottle cap in this PRO Mode Iron Audio setting The bottle cap makes a response that is unmistakably iron Final tip Record the results of your bench tests and refer to them when hunting in the field Knowledge of the PRO Mode and the Iron Audio feature can reduce the amount of trash targets that are dug 46 Garrett Metal Detectors UNDERWATER OPERATION The AT Pro can be immersed in water to a 3 meter depth maximum to search in and along shorelines rivers piers docks or swimming holes Use of the AT Pro at depths exceeding 3 meters can cause leaks and damage the detector Use of the AT Pro beyond the recommended depth will void the manufacturer s warranty For use in saltwater see tips on pages 41 42 The AT Pro is shipped with standard land use headpho
37. tions where the detector is behaving erratically due to excessive metallic trash highly mineralized soils saltwater beaches electrical interference or the presence of other metal detectors 30 Garrett Metal Detectors GROUND BALANCE GND BAL Indicator only displays on PEE COIN i r3 DEPTH LCD when in use GND BAL Setting only displays while in Ground Balance mode RON PINPOINT AUDIO L Frog Ad NOTCH DISC GND BAL Pushbutton Pushbutton use with GND BAL GND BAL Pushbutton Hold for Automatic Ground Balance or use in conjunction with the NOTCH DISC pushbuttons for Manual Ground Balance Detector performance can be negatively affected by ground mineralization The AT Pro can be ground balanced either automatically or manually to cancel unwanted ground signals and obtain maximum stability and target detection Automatic Ground Balance Press and hold the GND BAL pushbutton while continually bouncing or pumping the searchcoil from 2 to 20 centimeters above the ground When there is a minimal audio response from the ground release the pushbutton and begin hunting The ground balance value will have been indicated in the center of the LCD Low ground AT Pro International 31 balance values indicate conductive soil high ground balance values indicate ferrous soil Manual Ground Balance You may want to use the Manual Ground Balance function to ground balance slightly positive to enhance detection of
38. uce the detector s performance AT Pro International 43 BENCH TESTS You should conduct bench tests to become more familiar with the AT Pro s operation in both Standard and PRO modes In addition the use of the Iron Audio feature should be tested in both Standard and PRO modes Suggested test items should include e Coins e Iron nail e Bottle cap or steel washer To conduct a bench test place the searchcoil on a flat non metallic surface that is several feet from other metallic objects Begin by testing in the STD Mode with the ZERO discrimination pattern Pass the coins individually across the searchcoil at a distance of 8 to 10 cm Listen to the audio tone that the detector produces for each coin while also observing the Target ID for each Next select the PRO Mode For bench testing place the searchcoil on a flat stable non metallic surface that is several feet from other metallic objects 44 Garrett Metal Detectors with ZERO discrimination and pass the same coins across the searchcoil Observe the sounds as well as the Target ID as each target is tested The proportional audio characteristics of the PRO Mode can be easily understood using such bench testing Pass the coins across the searchcoil at distances that vary from 5 cm to 10 cm to 15 cm In STD Modes the test targets will produce a consistent full strength tone regardless of their distance from the coil Discrimination bench test A similar test proc
39. utton Use the PINPOINT Freq Adj pushbutton in conjunction with the or SENSITIVITY pushbuttons to adjust frequency The AT Pro is capable of operating at four slightly different frequencies in order to minimize the interference caused by electrical sources e g power lines or other metal detectors To adjust frequencies hold down the PINPOINT button and press the or SENSITIVITY pushbuttons to change the frequency to find one with the least amount of interference The frequency setting F1 F4 will be indicated on the LCD Release the PINPOINT button when finished Note Frequency adjustments are small and therefore do not affect target detection capabilities AT Pro International 33 PINPOINTING Press and hold the Pinpoint pushbutton to determine the exact location of a target To use the pinpoint function position the searchcoil to the side of the targets suspected location at a fixed height above the ground e g 2cm Press and hold the Pinpoint button and sweep the searchcoil over the target area while maintaining the same fixed height above the ground e g 2cm Sweep the searchcoil side to side and front to back in a crosshair pattern to locate the peak signal Note it is recommended to maintain a constant height during the entire Pinpointing process to prevent ground mineralization from producing false signals or masking the target s signal The bar graph on the LCD can also aid in locating the peak sig
40. ximum signal strength is displayed on the LCD Image A Then pull the searchcoil slowly toward you see Image A while noting the target signal PULL COIL TOWARD YOU ep Indicates target position Image B Once the target signal drops off both audibly and on the LCD meter shallow targets should be located immediately in front of the searchcoil s tip see Image B Deep targets will be under or just inside your searchcoil s tip This is because the conical shape of the searchcoil s detection field begins bending in slightly as the depth increases AT Pro International 37 You can reverse this pinpointing technique to pinpoint off the DD coil s tail in this case push the coil away from you The audio and LCD meter will place the target just off the searchcoil s tail Alternative pinpointing technique DD wiggle Quickly locate targets without using the Pinpoint button as follows Continuously swing the searchcoil side to side using fast narrow swings of 5 10cm i e wiggle While continuing this side to side wiggle slowly move the searchcoil sideways toward the target s suspected position until the audio response produces a consistent symmetric beat This indicates the lateral left to right position of the target Then locate the targets front to back position by rotating around 90 and repeating the same process Tip Practice any or all of these various pinpointing options in your test plot Choose the tec
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