Garrett Metal Detectors Radar Detector 1350 User Manual

Owners  
Manual  
TM  
$3  
 
TABLEꢀOFꢀCONTENTS  
To The Owner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
GTP 1350 Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
GTP 1350 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
GTP 1350 Touchpad Functions  
POWER.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
MENU / SCROLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Audio Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Salt Elimination . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Tone ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
Battery Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
OPERATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
ACCEPT / REJECT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
PINPOINT / PROFILING. . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
LAST MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
+ and -.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
LCD Graphic Display  
Target ID Guide (Legend) . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
Upper Scale. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
Lower Scale. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
Numerical Reference Guide . . . . . . . . . . . . . . . . . . . . . . . . . 24  
Profiling Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
Battery.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
Overload Audio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
Coin Depth Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
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Graphic Target Profiling 1350  
 
Junk Targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
Field Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
Test Plot Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34  
Bench Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35  
Batteries........ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37  
Headphone Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40  
Battery Pack Hip Mount. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40  
Searchcoils... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41  
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42  
Service and Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43  
Mind Your Manners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45  
RAM Books... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47  
Warning!........ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49  
RAM Books Order Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51  
Features and Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53  
4
Garrett Metal Detectors  
 
TO THE OWNER  
Congratulations! As the proud owner of the Garrett  
GTP 1350 you have joined an international family  
of treasure hunters. Men, women and children alike  
have used their Garrett detectors to find coins, relics  
and gold nuggets that are valued in the millions of  
dollars. To get the most out your GTP 1350 and  
treasure hunting experiences be sure to carefully  
read through this Owner’s Manual!  
Your GTP 1350 is the first of its class to offer size  
information that will enable you to know more about  
your target before you dig. With its exciting profiling  
technology, you can know the size (Small, Medium,  
Large) of a target before you dig. And when coupled  
with Garrett’s highly acclaimed PROformance  
searchcoils, you search deeper and cover more  
ground per sweep than with traditional searchcoils.  
YourGTP1350isalsoengineeredwithDSPenhanced  
technology and is backed by 40 years of metal  
detection research and development by Garrett’s  
Graphic Target Profiling 1350  
 
leading team of engineers. It is unparalleled in its  
ability to locate coins, jewelry and other metallic  
objects at greater depths than any other metal  
detector in its class. With Garrett’s revolutionary  
Graphic Target Analyzer (GTA) display that offers  
target acceptance/rejection, precise discrimination  
and other key information, you can spend more time  
digging treasure and less time digging trash.  
As the one of the world’s most intelligent detectors,  
the GTP 1350 is factory preset to begin operation  
in the COINS mode. Simply press the POWER  
touchpad on your new GTP 1350 and immediately  
begin hunting without the troublesome interference  
from typical trash items or ground minerals. Of  
course, you can easily adjust the detector to operate  
in other hunting modes.  
Again, welcome to the Garrett treasure hunting  
family. In becoming a part of this great tradition and  
hobby, you have made the right start to successful  
treasure hunting.  
6
Garrett Metal Detectors  
 
GTP 1350 PARTS  
Before assembling your GTP 1350 metal detector  
ensure you have the complete set of parts, which  
include:  
• Control Housing with S-shaped Ramrod Stem  
• Upper Stem  
• Lower Stem with Spring Clip  
• Two (2) Mounting Washers  
• One (1) Wing Nut  
• One (1) Threaded Bolt  
• Searchcoil with Cable  
• Instruction Video  
• Warranty Registration Card  
If any part is missing, please contact your local dealer.  
Graphic Target Profiling 1350  
 
GTP ASSEMBLY  
No tools are required to assemble the GTP 1350.  
Hand tighten all necessary parts.  
1. Press the two Mounting Washers into the Lower  
Stem. See Figure 1.  
Figure 1  
2. Slide the searchcoil onto the Stem (Figure 2).  
Figure 2  
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Garrett Metal Detectors  
 
3. Insert the Threaded Bolt through the holes of  
the Lower Stem and Searchcoil. Hand-tighten the  
searchcoil assembly with the remaining Wing Nut.  
See Figure 3.  
Figure 3  
4. Depress the Spring Clip and insert the Control  
Housing into the Upper Stem.  
5. Depress the Spring Clip in the Lower Stem to  
adjust to the most comfortable operating length.  
See Figure 4.  
Figure 4  
Graphic Target Profiling 1350  
 
6. Wrap the Searchcoil cable snugly about the stem  
with the first turn of the cable over the stem. See  
Figure 5.  
Figure 5  
7. Insert the Cable into the Connector of the Control  
Housing and hand-tighten. See Figure 6.  
Figure 6  
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Garrett Metal Detectors  
 
TOUCHPAD FUNCTIONS  
The GTP 1350 has eight (8) touchpads that control  
all operating functions. The battery pack and  
headphone jack are located beneath the arm rest.  
POWERꢀTouchpad  
Press the POWER touchpad once to turn the  
detector ON or OFF. The detector will beep twice  
when turned ON and once when turned OFF.  
If, after making adjustments to the 1350, you wish  
to return to the factory recommended settings, press  
and hold the POWER touchpad for approximately  
ten (10) seconds, or until the detector beeps twice.  
11  
Graphic Target Profiling 1350  
 
Each time the GTP 1350 is turned on, it returns  
to the most recent settings it was programmed to  
use. However, modifications made to the COINS,  
JEWELRY, RELIC and ZERO Discrimination settings  
are not stored by the 1350 when turned OFF.  
MENUꢀ/ꢀSCROLLꢀTouchpad  
Press the MENU / SCROLL touchpad to scroll  
through the MENU options to make adjustments to  
the detector’s settings.  
Press the MENU touchpad to advance to each  
item in the MENU selection or press the OPERATE  
touchpad after making an adjustment to resume  
hunting. The 1350 will automatically return to the  
OPERATE mode if no touchpads are pressed within  
30 seconds.  
MODEꢀ(DiscriminationꢀMode)  
Press the (+) or (-) touchpad to select the desired  
Discrimination MODE: COINS, JEWELRY,  
RELICS, ZERO, or CUSTOM. The selected  
MODE does not flash.  
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Garrett Metal Detectors  
 
COINS MODE—Designed to eliminate detection  
of lower conductivity trash targets such as  
iron, bottle caps, most pull tabs and other objects  
normally encountered in coin hunting. Some bent  
pull tabs and pieces of tabs may not be eliminated  
from detection. Some digging of junk targets is to  
be expected on occasion.  
JEWELRY MODE—Designed to eliminate trash  
targets such as lower conductivity items and  
bottle caps, while still detecting jewelry.  
RELICS MODE—Designed to eliminate trash  
targets normally associated with relic hunting,  
while retaining good targets in the lower  
conductivity range.  
ZERO MODE—Designed to hunt with no  
discrimination and alert the operator of every  
metal target.  
CUSTOM MODE—A Discrimination Mode that is  
programmed solely by the operator. The GTP  
13  
Graphic Target Profiling 1350  
 
1350 is factory preset with the CUSTOM Mode  
set the same as the COINS Mode. By using the  
ACCEPT / REJECT touchpad, an operator can  
modify the Discrimination settings to individual  
specifications, which will be retained in the  
CUSTOM Mode.  
SENSITIVITY  
Press the (+) or (-) touchpad to select the desired  
SENSITIVITY level, indicated on the Lower Scale  
of the LCD panel. The 1350’s Sensitivity setting  
can be adjusted from 3 (least sensitive) to 12  
(most sensitive).  
The default SENSITIVITY setting is set to 9  
(approximately 75 percent). It may be necessary  
to reduce the SENSITIVITY setting in locations  
where abnormal amounts of interference, trash  
or other metal detectors are present. In these  
situations, reduce the sensitivity until the audio  
becomes stable. When searching for very small  
or very deep targets it might be beneficial to  
increase the sensitivity setting as much as  
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Garrett Metal Detectors  
 
possible, prior to the point where the detector  
becomes unstable.  
AUDIOꢀTHRESHOLDꢀLEVEL  
Press the (+) or (-) touchpad to adjust the audio  
THRESHOLD level, indicated on the Lower Scale  
of the LCD panel. The audio THRESHOLD refers  
to the volume of the background “hum” made by  
the detector when no metal is being detected.  
FREQUENCY  
Press the (+) or (-) touchpad to select between 4  
(four) operating FREQUENCY settings, indicated  
on the Lower Scale of the LCD panel. The  
FREQUENCY setting may need to be changed  
when nearby electronic equipment or other metal  
detectors cause interference.  
VOLUME  
Press the (+) or (-) touchpad to adjust the  
VOLUME, indicated on the Lower Scale of the  
LCD panel. The VOLUME setting adjusts the  
sound level made when a target is detected.  
1ꢁ  
Graphic Target Profiling 1350  
 
TONE  
Press the (+) or (-) touchpad to adjust the TONE,  
indicated on the Lower Scale of the LCD panel.  
The TONE refers to the pitch of the sound the  
detector makes when a target is found.  
SALTꢀELIMINATION  
Press the (+) touchpad to activate SALT  
ELIMINATION or the (-) touchpad to deactivate  
(flashing) SALT ELIMINATION. The SALT  
ELIMINATION MODE eliminates interference  
caused by wetted salt; a feature that is particularly  
helpful when hunting on saltwater beaches.  
TONEꢀID  
Press the (+) touchpad to activate the TONE ID  
or the (-) touchpad to deactivate (flashing) the  
TONE ID. When activated, the TONE ID feature  
produces tones of varying pitches to indicate  
a target’s conductivity: high conductivity targets  
produce  
a
high-pitched belltone; medium  
conductivity targets produce a standard-pitched  
tone; and low conductivity targets produce a low-  
16  
Garrett Metal Detectors  
 
pitched audio signal. A high-pitched tone replaces  
the standard belltone when the PROFILING  
feature is activated. (See Table on Page 18 for  
additional information).  
BACKLIGHT  
Pressthe(+)touchpadtoactivatetheBACKLIGHT  
or the (-) touchpad to deactivate (flashing) the  
BACKLIGHT. The BACKLIGHT illuminates  
the LCD screen for low light or night hunting  
conditions.  
BATTERYꢀTYPE  
When using rechargeable batteries press the  
(+) touchpad to activate the RECHARGEABLE  
battery option. Press the (-) touchpad to  
deactivate (flashing) the RECHARGEABLE  
battery option when using standard  
batteries. This setting affects only the battery  
meter readings, not detector operation.  
1ꢂ  
Graphic Target Profiling 1350  
 
Setting  
Function  
All tones have the same standard  
pitch. Tone duration changes with  
the strength of the target signal  
(e.g. the stronger the target  
signal, the longer the duration).  
Tone ID OFF/Profiling OFF  
The tone duration changes, but  
the pitch remains the same (e.g.  
a small target produces a quick,  
standard tone; a medium target  
produces a medium, standard  
tone; a large target produces a  
long standard tone).  
Tone ID OFF/Profiling ON  
The tone of the detector changes  
to indicate the conductivity of  
the target (e.g. low conductivity  
produces a low tone; medium  
conductivity produces a standard  
tone; high conductivity produces  
a high belltone).  
Tone ID ON/Profiling OFF  
The tone duration varies with size  
and pitch varies with conductivity  
(No belltone signal produced  
when Profile is being displayed).  
Tone ID ON/Profiling ON  
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Garrett Metal Detectors  
 
OPERATEꢀTouchpad  
Press the OPERATE touchpad at any time to  
return to the hunting mode while making changes  
or adjustments during the MENU / SCROLL  
sequence.  
ACCEPTꢀ/ꢀREJECTꢀTouchpad  
Use the ACCEPT / REJECT touchpad to modify the  
Notch Discrimination pattern, shown on the Lower  
Scale of the LCD screen.  
Press the (+) or (-) touchpad to move the Target  
ID cursor to the right or left. Press the ACCEPT/  
REJECT touchpad to activate or delete the LCD  
cursor, located on the Lower Scale, directly below  
the Target ID cursor. Press the OPERATE touchpad  
to resume hunting when Notch Discrimination  
modifications are completed.  
The GTP 1350 does not produce an audible  
response when it locates a target found in notched  
(blank) regions of the Lower Discrimination scale.  
1ꢃ  
Graphic Target Profiling 1350  
 
Modifications made to the Lower Discrimination scale in  
the CUSTOM Mode will be retained when the detector is  
turned OFF, until manually changed by the operator or  
until the detector is returned to the factory default settings  
by pressing and holding the POWER touchpad. Any  
changes made to Discrimination settings while hunting in  
all other MODES will be lost when the detector is turned  
OFF and will return to the factory default settings.  
Discrimination settings can also be modified quickly  
when an unwanted target is located while hunting. When  
an unwanted target is discovered, press the ACCEPT /  
REJECT touchpad to create a Notch (delete the cursor)  
for that specific target.  
You may want to customize your Discrimination settings  
when you are looking for a specific item, a lost earring  
for example. You can use the matching earring to  
set notches on your GTP 1350 to accept only that  
target. Hunting in an area where a specific type of  
trash is abundant may be another reason to customize  
your Notch Discrimination settings. You can reject the  
specific type of trash and continue to hunt with no other  
discrimination, detecting all other metal.  
20  
Garrett Metal Detectors  
 
PINPOINTꢀ(CoinꢀDepth)ꢀ/ꢀPROFILINGꢀTouchpad  
Press and hold the PINPOINT touchpad to enter  
the PINPOINT Mode and find the exact location and  
coin depth of a target.  
When the PINPOINT touchpad is released the  
PROFILING feature will automatically turn ON  
to provide target size information. To exit the  
PROFILING feature, briefly press and release the  
PINPOINT / PROFILING touchpad again.  
When enabled, the PROFILING feature visually  
indicates the size (Small, Medium, Large) of detected  
targets on the LCD screen as well as with three (3)  
distinct audio durations.  
(See page 27—30 for more information).  
LASTꢀMODEꢀTouchpad  
Returns the detector to the previous Discriminate  
Mode. This feature can be used to rapidly switch  
between two (2) selected modes, such as COINS  
and RELICS.  
ꢀ1  
Graphic Target Profiling 1350  
 
+ꢀandꢀ-ꢀTouchpad  
Press the (+) and (-) touchpads to move the Target  
ID cursor when modifying Discrimination settings  
and when adjusting all MENU settings.  
LCD DISPLAY  
Target ID  
Upper Scale  
Guide  
Lower Scale  
Profiling  
Display  
22  
Garrett Metal Detectors  
 
TargetꢀIDꢀGuideꢀ(Legend)  
An illustrated Target ID Guide is located directly  
above the LCD screen. When hunting, the Target  
ID cursor will appear below the illustration that  
most likely indicates the type of target found, based  
on its conductivity. Three (3) color-coded bands  
correspond with the Small (red), Medium (blue) and  
Large (green) target size shown on the Profiling  
display.  
UpperꢀScale  
The Upper Scale located at the top of the LCD  
screen is used to display the Target ID cursor, which  
indicates the probable identity of a detected target.  
When the Pinpoint button is held down, this scale is  
used to display the strength of the Pinpoint target  
signal, as a bar increasing from left to right.  
LowerꢀScale  
The Lower Scale, or Notch Discrimination Scale,  
indicates those regions where the GTP 1350 will or  
will not produce an audible signal when a target is  
located. Where a notch is present (those regions of  
ꢀ3  
Graphic Target Profiling 1350  
 
the Lower Scale where no cursors are visible) no  
audible signal will be produced by those targets.  
The Lower Scale also indicates settings for  
SENSITIVITY, THRESHOLD, FREQUENCY,  
VOLUME and TONE as well as the depth of  
a coin-sized target (measured in inches) when  
pinpointing.  
NumericalꢀReferenceꢀGuide  
The Numerical Reference Guide is used to indicate  
SENSITIVITY, THRESHOLD, FREQUENCY,  
VOLUME and TONE settings as well as the depth  
(in inches) of a coin-sized target when pinpointing.  
ProfilingꢀDisplay  
Located at the bottom of the LCD screen, the  
Profiling Display indicates the size of a target  
(Small, Medium and Large).  
Battery  
The Battery scale, shown on the bottom, right hand  
corner of the LCD screen, indicates the amount of  
power remaining in the batteries.  
24  
Garrett Metal Detectors  
 
OPERATING INSTRUCTIONS  
1. Lower the searchcoil to a level approximately one  
(1) inch above the ground.  
2. Press the POWER touchpad, two (2) beeps  
will sound to indicate the GTP 1350 is ON. Each  
time the 1350 is turned on, it returns to the most  
recent settings it was programmed to use, with  
the exception of modifications made to the Notch  
Discrimination settings in the pre-programmed  
Modes. (See ACCEPT / REJECT on page 19 for  
additional information.)  
The GTP 1350 is engineered with Automatic Ground  
Balance technology to continuously measure ground  
mineralization and automatically adjust itself for  
optimum performance.  
3. Begin scanning by moving the searchcoil from  
side to side in front of you, in either a straight line  
or a slight arc pattern. Keep the coil level and at a  
constant height of about one (1) to two (2) inches  
ꢀꢁ  
Graphic Target Profiling 1350  
 
above the ground. Do not allow the searchcoil to  
raise or tilt at the end of the swing, much like a “golf”  
swing. This can significantly degrade detection  
performance. Scan the searchcoil at a rate of about  
two (2) to five (5) feet per second.  
4. The GTP 1350 will produce an audio signal and  
illuminate a Target ID cursor on the LCD screen  
when metal is detected. The Target ID cursor  
will appear directly below the Target ID Guide  
to reference the probable identity of the target.  
Highly mineralized soils can occasionally produce  
improper Target ID readings. Raising the searchcoil  
an inch or two as you scan over such soils can be  
helpful. Remember to keep the searchcoil level and  
at a constant height. Be aware that encrustation,  
or patina, may also affect conductivity of a target  
resulting in improper Target ID.  
5. When a target is located, make two (2) or  
three (3) repeated scans over it to determine its  
approximate location.  
26  
Garrett Metal Detectors  
 
6. Pinpoint the target to find its exact location. Place  
the searchcoil on the ground near, but not directly  
over the target’s suspected location. Then press and  
hold the PINPOINT touchpad. While maintaining  
contact with the ground, first scan the searchcoil left  
to right then scan front to back (i.e. make an X) until  
the loudest sound is produced, indicating the target  
is directly beneath the center of the searchcoil.  
In addition to the audio, the Upper Scale will also  
indicate when you are directly over the target by  
displaying the greatest signal strength, increasing  
from left to right. Simultaneously, the Lower Scale  
will indicate the depth (in inches) of a coin-sized  
target. A target larger than a coin will indicate a  
depth reading that is shallower than it actually is,  
and visa versa for a target smaller than a coin. Note  
that the Upper Scale will also blink the Target ID  
cursor, only as a reminder, of the Target ID that was  
last obtained prior to entering the Pinpoint Mode.  
7. The PROFILING feature automatically activates  
upon releasing the PINPOINT / PROFILING  
touchpad after pinpointing the target. When the  
ꢀꢂ  
Graphic Target Profiling 1350  
 
PROFILING feature is activated a target’s size  
is indicated as Small, Medium or Large on the  
Profiling display. Small targets include those which  
are approximately 1.5 inches in diameter or less  
(e.g. most U.S. coins). Medium targets range from  
approximately 1.5 to 4 (four) inches in diameter (e.g.  
silver dollar or flattened drink can.) Targets greater  
than 4 (four) inches are classified as Large.  
To obtain accurate size information, repeatedly  
sweep the searchcoil side to side, 7 (seven) inches  
past the center of the target in a smooth, continuous  
motion. The full sweep motion should cover a total  
of 14 inches (7 inches from each side of the target)  
with the target being in the center. (See Figure 7).  
14"  
Figure 7  
28  
Garrett Metal Detectors  
 
IMPORTANT!  
To achieve optimum results when Profiling:  
Isolate and pinpoint the target (Press and  
hold the PINPOINT touchpad) to determine its  
exact location.  
Make sure you are only detecting one target at  
a time. Profiling multiple targets at the same  
time may produce inaccurate results; if  
necessary, scan the target from different  
angles.  
Release the PINPOINT button and repeatedly  
swing the searchcoil from side to side (not  
front to back) using a smooth, steady and  
continuous motion to Profile the target. Be  
sure to make a consistent sweep width  
of 14 inches. The speed at which you swing  
the coil can range from as slow as 1.2  
seconds between consecutive beeps up to  
as fast as 0.4 seconds between beeps. If the  
target’s Profile (size) consistently displays  
ꢀꢃ  
Graphic Target Profiling 1350  
 
smaller that actuality, then your Profiling  
sweep width is too wide. Conversely, if the  
target Profile displays larger than it actually is,  
then your sweep width is too narrow. Maintain  
a 14” sweep width to correct this error.  
Some targets may fall on or near the boundary of  
two sizes. In such cases, the PROFILING display  
may change between sizes on successive sweeps  
(i.e. a screw cap may read Small to Medium).  
When Profiling a target, a distinctive “chirp” at the  
beginning of each audible signal means that you’re  
achieving a valid target profile. The audio’s duration  
(short, medium or long) denotes the target’s size  
(Small, Medium, Large). The target size will also be  
shown on the Profiling display. Targets that are too  
deep, or too small, to be profiled are indicated with  
a short “blip” and a blank Profiling Display.  
30  
Garrett Metal Detectors  
 
OVERLOAD AUDIO  
Very large and / or close targets may cause the GTP  
1350’s circuitry to overload, resulting in inaccurate  
Target ID and Profiling information. If target overload  
occurs, as indicated by a machine-gun sound, raise  
the searchcoil a few inches until the overload audio  
ceases.  
COIN DEPTH MEASUREMENT  
PinpointthetargetasmentionedinthePINPOINTING  
section. While still pressing the PINPOINT touchpad,  
check the Lower Scale to determine the coin-depth  
in inches. You will notice that coin-depth always  
indicates the shallowest (most accurate) reading  
and will not be overwritten by subsequent off-center  
scans.  
31  
Graphic Target Profiling 1350  
 
JUNK TARGETS  
The GTP 1350’s factory default COINS mode will  
not audibly respond to most junk targets. It may,  
however, respond with a signal that is not as clear  
or sharp as that of a coin signal. It is recommended  
that before digging these “blips”, the region where  
the Target ID cursor is illuminated on the Upper  
Scale is verified. Often, a junk target has been found  
when a Target ID cursor illuminates irregularly.  
It is not unusual for a junk target, such as an  
aluminum soft drink can to give an audio signal  
indicating that a good target has been discovered  
due to its conductivity. However, the Profiling  
Display can aid in the identification of such targets  
before you dig.  
Rusty iron targets may cause jumpy or non-  
repeatable ID readings.  
32  
Garrett Metal Detectors  
 
FIELD OPERATIONS  
As you walk, scan the searchcoil from side to side  
in a straight line or slight arc pattern. Keep the coil  
level and at a constant height of one or two inches  
above the ground while you scan at the rate of two  
to five feet per second.  
When scanning, do not hurry. Be methodical.  
Overlap each scan sweep at least 25 percent of  
the searchcoil’s width. Wear headphones to avoid  
ambient noises and to concentrate on scanning.  
When you are searching in the ZERO Discrimination  
Mode, every metallic target will produce an audible  
sound.  
33  
Graphic Target Profiling 1350  
 
TEST PLOT CONSTRUCTION  
Your own test plot section will enable you to increase  
your treasure hunting proficiency. Create a test plot  
by burying several items at varying depths of one  
(1) to six (6) inches about 18 inches apart. Include  
coins, rings, nails, foil, pull tabs and bottle caps.  
Bury larger items, such as a 12 ounce soda can,  
approximately ten (10) inches deep. Clearly mark  
where each article is buried and its depth. Scan over  
them while carefully studying the detection signals.  
Newly buried objects, especially coins, will be  
more difficult to detect than items buried over time.  
Experiment with various detection modes and pay  
close attention to audio, Target ID and Profiling  
signals as you scan.  
34  
Garrett Metal Detectors  
 
BENCH TESTING  
Bench testing enables you to test typical trash items  
and learn about the discrimination capabilities of the  
GTP 1350 before taking it into the field or attempting  
to alter the Discrimination settings. The following  
tests should be performed as shown below with the  
searchcoil perpendicular to a bench, floor or other  
non metallic object.  
1. Select the ZERO Discrimination Mode.  
2. Pass various metallic objects across the  
bottom of the searchcoil at a distance of about  
two inches. Each target will cause the sound  
to increase, which represents true,  
non-discriminating operation.  
3. Select the COINS Mode.  
4. Press the OPERATE touchpad  
5. Pass the same metallic targets (as used in 2)  
across the bottom of the searchcoil and listen  
3ꢁ  
Graphic Target Profiling 1350  
 
for the sound to increase only when certain  
items are scanned. Notice the specific  
segments on the Upper Scale of the display  
that are highlighted when various targets are  
passed across the searchcoil.  
6. Perform the same tests in the JEWELRY Mode  
and observe the sounds produced.  
7. Experiment with the ACCEPT / REJECT  
touchpad. Notice which of the 24 segments  
are illuminated as you identify various  
targets.  
8. Keep written records of the results and use  
them when hunting in the field. Remember that  
your detector is a sensitive electronic  
instrument, but is engineered to withstand  
rugged treatment in the outdoors. Use your  
detector to the fullest extent, but always  
protect and handle it with reasonable care.  
36  
Garrett Metal Detectors  
 
BATTERIES  
The GTP 1350 requires eight (8) AA batteries  
(included), which are contained in two battery  
compartments that hold 4 (four) batteries each.  
These holders slide into the Battery Pack beneath  
the Arm Rest assembly. When replacing batteries,  
ensure they are installed correctly and the holders  
are inserted into the case with the rivet at the  
bottom of the holder towards the center of the case.  
Failure to install the batteries correctly may result in  
electronic damage to the detector.  
The condition of the batteries is continuously  
displayed on the LCD display while the detector is  
turned on. Five (5) or four (4) bars on the battery  
scale (located on the LCD screen) indicate the  
batteries are very good; three (3) bars indicate the  
batteries are good; two (2) bars and the batteries are  
adequate; one (1) single bar indicates the batteries  
need to be replaced. Batteries should be replaced  
or recharged when there is only one segment  
illuminated. Internal circuitry ensures the detector’s  
operation and performance are not affected by  
battery condition, until batteries are drained.  
3ꢂ  
Graphic Target Profiling 1350  
 
The GTP 1350 is engineered with a battery saving  
feature. If no touchpads are pressed within 30 minutes of  
being turned ON, the detector automatically turns OFF in  
order to minimize battery use due to accidental turn ON.  
Simply press the POWER touchpad to resume hunting.  
The GTP 1350 does not come with an on-board battery  
recharge function.  
Completely remove all batteries from the detector when  
stored for extended periods.  
Replace or remove batteries by following these  
instructions:  
1. Turn the GTP 1350 OFF by pressing the POWER  
touchpad.  
2. Slide the battery case back slightly from its normal  
position beneath the Arm Rest. Place both thumbs  
on the lower sides of the cuff with your fingers on  
the front of the case. Firm pressure will then  
disengage the case from below the Arm Rest and  
allow it to slide backward.  
3. Slip the two covers on the battery panel up and  
remove them completely.  
38  
Garrett Metal Detectors  
 
4. Slide out the two battery holders (which are  
not connected by the wire) by tilting the pack.  
Each of the holders contains four AA  
batteries.  
5. Remove the old batteries.  
6. Install new batteries. Carefully observe the  
polarity of the batteries and place them in the  
holders.  
7. Replace the battery holders in the GTP 1350.  
Ensure the rivet on each side of the battery  
holder is visible in the center of the battery  
case. If the holders are replaced incorrectly, it  
will be difficult to install the battery covers.  
8. Press down and firmly slide each battery  
cover into place.  
CAUTION!  
Use high quality rechargeable (NiCad, NiMH),  
carbon, alkaline or heavy duty batteries.  
3ꢃ  
Graphic Target Profiling 1350  
 
HEADPHONEꢀJACK  
The headphone jack is located at the rear of the  
battery pack under the armrest. Headphones are a  
valuable accessory of any metal detector to mask  
interference from outside noise. They permit you to  
hear small and deep targets that might be missed  
when using only audio from the detector speaker.  
Headphones are particularly essential when hunting  
where noise of people and/or traffic is excessive.  
BATTERYꢀPACKꢀHIPꢀMOUNTꢀOPTION  
Hip mount adaptability is built into the GTP 1350.  
The purchase of an optional conversion kit is  
not necessary. Since no extension cable cord is  
required, you never have to worry about winding it  
around the detector’s stem or carrying it with you.  
When you slip the hip mount battery pack off and  
attach it to your belt with the built in clip, you reduce  
the weight of your detector by almost a pound. The  
cable cord is conveniently coiled to prevent tangling.  
When you use this hip mount feature, the GTP 1350  
weighs less than 2 3/4 pounds. All controls are still  
40  
Garrett Metal Detectors  
 
easily accessible and your GTP 1350 display is  
visible on the control stem of the detector.  
The removable hip mount pack and built-in coiled  
cable permit easy reassembly of carrying and  
storage. When reassembling, be sure the cable  
slides into its tube and is not pinched between the  
arm rest and the battery compartment.  
SEARCHCOILS  
Garrett takes pride in offering you a wide selection  
of searchoils and accessories that enable you to  
personalize your detector for the way you like to  
hunt treasure.  
The GTP 1350 comes with the 7x10” Elliptical  
searchcoil and is suitable for general hunting  
purposes. Additional coils include:  
• 10x14” DD  
• 9” x 12” PROformance  
• 4.5” Crossfire II  
When changing searchcoils, be sure to hand-tighten  
the knobs only. Do not use tools of any kind.  
41  
Graphic Target Profiling 1350  
 
MAINTENANCE  
Avoid extreme temperatures as much as possible,  
such as storing the detector in an automobile during  
hot summer months or in freezing weather.  
Clean your detector frequently. Wipe the housing  
after use and wash the coil with warm, soap water  
when necessary. Protect your instrument from dust  
and sand as much as possible.  
Your searchcoil is submersible; however, the control  
housing is not! NEVER submerge the control  
housing in water and ALWAYS protect it from heavy  
mist, rain or blowing surf.  
Disassemble the stem and clean it after use in  
sandy areas.  
When storing longer than one month, remove  
batteries from the detector.  
42  
Garrett Metal Detectors  
 
SERVICEꢀANDꢀREPAIR  
In case of difficulty, read this Owner’s Manual  
thoroughly to make certain your detector is not  
inoperable due to manual adjustments (Press and  
hold the POWER button for ten (10) seconds  
to return to the factory recommended settings).  
Contact your dealer for additional assistance.  
When your detector must be returned to the factory  
for service, make certain:  
You have checked batteries, switches and  
connectors. (Weak batteries are the most  
common cause of detector “failure”.)  
You have contacted your dealer, particularly if  
you are not familiar with the GTP 1350.  
You have included a letter that fully describes  
the problem and conditions under which they  
occur. Make certain to include your name,  
address and a phone number where you can  
be contacted between 8:30 a.m. and 4 p.m.,  
C.S.T.  
43  
Graphic Target Profiling 1350  
 
You have carefully packed the detector in its  
original shipping carton or other suitable  
box. Make certain that proper insulation or  
packing material is used to secure all parts.  
Do not ship stems or headphones unless  
they are part of the problem. Be certain to  
return all coils.  
Ship to:  
Garrett Metal Detectors  
1881 West State Street  
Garland, Texas 75042  
Call Garrett’s Customer Service Department  
(800-527-4011) if you have further questions.  
Please allow approximately one week for  
Garrett technicians to examine and repair  
your detector after they receive it, plus  
another week for return shipping.All equipment  
will be returned UPS or parcel post unless  
written authorization is given by you to ship  
collect by air parcel post, UPS Blue (air) or air  
freight.  
44  
Garrett Metal Detectors  
 
MINDꢀYOURꢀMANNERS  
Fill holes and obey NO TRESPASSING signs. A  
sincere request that Charles Garrett makes to every  
user of one of his detectors is that each hunt site be  
left in better condition than it was found. Thousands  
of individuals and organizations have adopted this  
formal Metal Detector Operators Code of Ethics:  
I will respect private and public property,  
all historical and archaeological sites and will  
not conduct metal detector searches on these  
lands without proper permission.  
I will keep informed about and obey all laws,  
regulations and rules governing federal, state  
and local public lands.  
I will aid law enforcement officials whenever  
possible.  
I will not cause willful damage to property of  
any kind, including fences, signs and buildings  
and will always fill holes I dig.  
4ꢁ  
Graphic Target Profiling 1350  
 
I will not destroy property, buildings or  
the remains of ghost towns and other deserted  
structures.  
I will not leave litter or uncovered items lying  
around. I will carry all trash and dug targets  
with me when I leave each search area.  
I 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.  
46  
Garrett Metal Detectors  
 
RAMꢀBOOKS  
Since your Garrett GTP 1350 is a truly universal  
detector, all of the RAM books will be pertinent to its  
use. Of particular interest, however, will be The New  
Successful Coin Hunting by Charles Garrett, filled  
with “how to” tips and success stories about coin  
hunting. This is the complete 21st century guide to  
searching for coins with a modern metal detector  
such as the GTP 1350.  
For beginners, however, the new edition of Treasure  
Hunting for Fun and Profit will prove especially  
interesting and helpful.  
Treasure hunters will also appreciate the revised  
version of Garrett’s popular Modern Metal Detectors,  
a basic text that will help you understand all types  
of metal detection equipment and how to use them.  
A special section of the revised edition is devoted to  
the use of One-Touch computerized detectors.  
Where can you hunt? How about ghost towns and  
deserted structures? You will read about them in  
4ꢂ  
Graphic Target Profiling 1350  
 
Garrett’s Ghost Town Treasures. Also, Bob Marx’s  
Buried Treasures You Can Find identifies thousands  
of sites across the United States where treasure is  
known to have existed. In this fine book Bob also  
gives helpful advice about One-Touch detectors  
offered by Garrett.  
Since the GTP 1350 can be used for finding gold  
nuggets and ore veins, you will be interested in Find  
Gold with a Metal Detector. All hobbyists are urged  
to familiarize themselves with this most interesting  
and exciting aspect of metal detecting.  
48  
Garrett Metal Detectors  
 
WARNING!  
Any metal detector may discover underground  
power lines, explosives or other items which when  
struck could cause personal injury. When searching  
for treasure with your GTP 1350, observe these  
precautions:  
Do not hunt in an area where you believe there  
may be shallowly buried underground electric  
lines or pipes.  
Avoidstrikinganylineknowntobe,orsuspected  
to be, carrying electrical power.  
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 underground conditions.  
4ꢃ  
Graphic Target Profiling 1350  
 
50  
Garrett Metal Detectors  
 
RAM BOOKS ORDER FORM  
Please send me the following RAM books:  
(Please indicate number of copies desired.)  
___ New Successful Coin Hunting....................$9.95  
___ Treasure Hunting for Fun and Profit .........$9.95  
___ Treasure Caches Can Be Found.................$9.95  
___ Ghost Town Treasures................................$9.95  
___ You Can Find Gold with a Metal Detector....$9.95  
___ Buried Treasures You Can Find...............$14.95  
___ Gold of the Americas..................................$9.95  
___ New Modern Metal Detectors..................$12.95  
___ Gold Panning is Easy.................................$9.95  
___ How to Find Lost Treasure*.......................$3.95  
___ How to Find Gold ......................................$3.95  
___ How to Search Sand and Surf ....................$3.95  
* Free with the purchase of any other RAM book or  
Garrett product. If you do not wish to purchase anything but  
would like a free copy of How to Find Lost Treasure, mail  
$2.00 for postage/handling to our address. U.S. orders only.  
For international orders, contact [email protected].  
Please send payment to:  
RAM Publishing Co.  
1881 West State Street  
Garland, Texas 75042  
(Order form continued on back of this page)  
ꢁ1  
Graphic Target Profiling 1350  
 
MAIL-IN ORDER FORM  
Add $2.00 for first book, and $1.00 for each additional book  
ordered (maximum $3.00) for handling and shipping charges.  
Total for books  
$______________  
8.25% Tax (TX/CA residents) $______________  
Handling Charge  
$______________  
$______________  
TOTAL  
Payment Options:  
___ Enclosed check or money order  
___ I prefer to order through:  
___ American Express  
___ Visa  
___ MasterCard  
___ Discover  
Card Number: ______________________________  
Expiration Date of Card: _____________________  
Phone Number: ____________________________  
Signature: _________________________________  
Required on credit card purchases  
Name: ____________________________________  
Address: __________________________________  
__________________________________  
City/State/Zip: _____________________________  
52  
Garrett Metal Detectors  
 
FEATURESꢀANDꢀSPECIFICATIONS  
Audio Threshold, Adjustable  
Audio Tone ID  
Coin Alert Belltone Audio  
Digital Signal Processor (DSP)  
Discrimination, GTA Accept / Reject Notch  
Frequency, Adjustable  
Graphic Target Analyzer (GTA), Target ID cursor  
Ground Balance, Automatic Ground Tracking  
Headphone Jack  
Hip Mount Battery Pack  
Last Mode Switching  
LCD, Backlit Shows Target ID and Settings  
Microprocessor Controlled  
Pinpointing, Coin Depth Measurement  
PowerMaster Circuitry  
Profiling (Target Size)  
Salt Elimination Mode  
ScanTrack  
Sensitivity / Depth Adjustment  
Speaker  
Surface Mount PC Board Technology  
ꢁ3  
Graphic Target Profiling 1350  
 
Touchpad Controls with One-Touch Operation  
Volume Control  
Length: 40” to 51” - Adjustable  
Weight: 4.0 lbs (1.9 kgs)  
Frequency: 7.2 kHz  
8 AA Battery operation (batteries included)  
5 year warranty  
Search Modes: Coins, Jewelry, Relics, Zero and  
Custom  
Discrimination with Visual Target ID  
Settings: Sensitivity, Threshold, Detection  
Frequency, Volume, Tone and Full-Range Multi-  
Notch Discrimination  
Proof of Garrett excellence is the recognition  
given them by the following United States patents:  
4,709,213; 4,488,115; 4,700,139; 4,398,104;  
4,423,377; 4,303,879; 4,334,191; 3,662,255;  
4,162,969; 4,334,192; 5,148,151; 5,138,262;  
5,721,489; 5,786,696; 5,969,528; Design 274,704  
and 297,221; Design 333,990; G.B. Design  
2,011,852; Australia Design 111,674 and other  
patents pending.  
54  
Garrett Metal Detectors  
 
ꢁꢁ  
Graphic Target Profiling 1350  
 
1881 W. State Street  
Garland, Texas 75042  
Toll Free: 800.527.4011  
Tel: 972.494.6151  
Fax: 972.494.1881  
© 2008 Garrett Electronics, Inc.  
PN 1526000.C.0608  
Garrett Metal Detectors  
 

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