Garrett GTP 1350 User manual

To the Owner _______________________________ 5
GTP 1350 Parts _____________________________ 7
GTP 1350Assembly__________________________ 8
GTP 1350 Touchpad Functions
POWER ___________________________12
MENU / SCROLL ____________________13
Mode ______________________13
Sensitivity___________________15
Audio Threshold______________16
Frequency___________________16
Volume_____________________17
Tone_______________________ 17
Salt Elminination _____________17
Tone ID ____________________ 17
Backlight ___________________18
Battery Type_________________ 18
OPERATE__________________________20
ACCEPT/REJECT____________________20
PINPOINT / PROFILING ______________ 22
LAST MODE _______________________23
+ and - ____________________________ 23
3
NOTE:
In order to take full advantage of the special features
and functions of the GTP 1350, carefully read this
instruction manual in its entirety.
Thank you for choosing Garrett's Graphic Target Profiling
1350™ metal detector with PowerMaster™ circuitry.
This high performance metal detector harnesses the
power of advanced Digital Signal Processor (DSP)
technology to provide extremely accurate multiple
channel filtering, continuous adaptation to hunting
speedsandautomaticground trackingforsuperiordepth,
discrimination and pinpointing performance.
The GTP is easy to operate and those who demand it,
will find the GTP 1350 meticulously adapts to their own
style of treasure hunting.
2
Table of ContentsIntroduction
Graphic Target Profiling 1350

Congratulations! As the proud owner of the Garrett GTP
1350 you have joined an international family of treasure
hunters. Men,womenand even children alike have used
their Garrett detectors to find coins, relics and gold
nuggets that are valued in the millions of dollars. So, 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)ofa 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.
Your GTP 1350 is also engineered with DSP enhanced
5
LCD Graphic Display
Target ID Guide (Legend) _____________24
Upper Scale________________________24
Lower Scale________________________24
Numerical Reference Guide ___________ 25
Profiling Display_____________________25
Battery____________________________ 26
Operating Instructions _______________________ 27
Overload__________________________________ 33
Coin Depth Measurement ____________________ 34
Junk Targets_______________________________ 35
Field Operating Recommendations _____________ 36
Test Plot Contruction ________________________ 37
Bench Testing______________________________ 38
Batteries_____ _____________________________ 41
Headphone Jack ___________________________ 45
Hip Mount ________________________________ 46
Searchcoils________________________________ 47
Maintenance_______________________________ 48
Service and Repair__________________________49
Mind Your Manners__________________________52
RAM Books________________________________57
Specifications______________________________ 59
Warnings__________________________________56
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To the Owner

BeforeassemblingyourGTP1350metaldetectorensure
you have the complete set of parts, which include:
• Control Housing with S-shaped Ramrod Stem
• Upper Stem
• Lower Stem
• One (1) Spring Clip
• Two (2) Knobs
• Two (2) Washers
• One (1) Threaded Bolt
• Searchcoil
If any part is missing, please contact your local dealer.
7
technology and is backed by 40 years of metal detection
research and development by Garrett's 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. And with Garrett's
revolutionary Graphic TargetAnalyzer (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
GTP 1350 Parts

3. Insert the Threaded Bolt through the holes of the
searchcoil and hand-tighten the two Knobs (Figure 3).
9
No tools are required to assemble the GTP 1350. Hand
tighten all necessary parts.
1.Compressandinsert thebuttonendsofthe SpringClip
into the black Lower Stem (Figure 1). This allows the
overall stem length to adjust for operating comfort.
2. Attach the Lower Stem to the Searchcoil by inserting
two Washers into the Stem (adhere to stem) and slip the
Searchcoil onto the Stem (Figures 2 and 3).
8Figure 3
Figure 2
GTP 1350 Assembly
Figure 1

6. Insert the cable connector into the connector on the
housing and hand-tighten securely (Figure 6).
11
4. Install the Upper Stem to the Lower Stem (Figure 4)
and then this assembly to the GTP Control Housing by
depressing the two buttons and coupling the Stem to the
Housing unit. Adjust for the most comfortable operating
length.
5. Wrap the Searchcoil cable snugly about the stem with
the first turn of the cable over the stem (Figure 5).
10
Figure 6
Figure 5
Figure 4

Each time the 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.
MENU / SCROLL Touchpad
Press the MENU / SCROLL touchpad to scroll through
the MENU options to make adjustments to the detector’s
settings.
PresstheMENUtouchpad toadvancetoeachitem inthe
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.
MODE (Discrimination Mode)
Press the + or - touchpad to select the desired
Discrimination MODE: COINS, JEWELRY,
RELICS, ZERO, or CUSTOM. The selected
MODE does not flash.
13
The GTP 1350 has eight (8) touchpads that control all
operating functions. The battery pack and headphone
jack are located beneath the arm rest.
POWER Touchpad
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.
12
Touchpad Functions

CUSTOM MODE -ADiscrimination Mode that
is programmed solely by the operator. The
GTP 1350 is factory preset with the CUSTOM
Mode set the same as the COINS Mode. By
using theACCEPT / 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
programmed at 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. 15
COINS MODE - Designed to eliminate
detection of lower conductivity trash targets
such as iron, bottlecaps, most pulltabs and
other objects normally encountered in coin
hunting. Somebent pulltabs and pieces oftabs
may not be eliminated from detection. Some
digging of junk targets is to be expected on
occasion.
JEWELRYMODE - Designed to eliminate trash
targets such as lower conductivity items and
bottlecaps, 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.
14

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 located.
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.
SALT ELIMINATION
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.
Tone ID
Press the + touchpad to activate the TONE ID
17
When searching for very small or very deep
targets it might be beneficial to increase the
sensitivity setting as much as possible, prior to
thepointwherethedetectorbecomesunstable.
AUDIO THRESHOLD LEVEL
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.
16

battery option. Press the - touchpad to
deactivate (flashing) the RECHARGABLE
battery option when using standard batteries.
This setting affects only the battery meter
readings, not detector operation.
19
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-pitched audio signal. A
high-pitched tone replaces the standard
belltone when the PROFILING feature is
activated. (See Table 1 on Page 19 for
additional information)
BACKLIGHT
Press the + touchpad to activate the
BACKLIGHT or the - touchpad to deactivate
(flashing) the BACKLIGHT. The BACKLIGHT
illuminates the LCD screen for low light or night
hunting conditions.
BATTERY TYPE
When using rechargeable batteries press the +
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Setting Function
Tone ID OFF / Profiling OFF
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 ON
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 ON / Profiling OFF
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 ON
The tone duration varies with size and
pitch varies with conductivity. (No
belltone signal produced when Profile is
being displayed).
Table 1

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
NotchDiscriminationsettings. You can reject the specific
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OPERATE Touchpad
Press the OPERATE touchpad at any time to return to
the hunting mode while making changes or adjustments
during the MENU / SCROLL sequence.
ACCEPT / REJECT Touchpad
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 1350 does not produce an audible response when it
locates a target found in notched (blank) regions of the
Lower Discrimination scale.
Modifications made to the Lower Discrimination scale in
20

LAST MODE Touchpad
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.
+ and - Touchpad
Pressthe+and-touchpadstomovetheTarget IDcursor
when modifying Discrimination settings and when
adjusting all MENU settings.
23
type of trash and continue to hunt with no other
discrimination, detecting all other metal.
PINPOINT (Coin Depth) / PROFILING Touchpad
Press and hold the PINPOINT touchpad to enter the
PINPOINT Mode and find the exact location and coin-
depth of a target. (See page 29 for more information).
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.
Whenenabled,thePROFILINGfeature 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 29 for more information).
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Target ID Guide
Upper
Scale
Lower
Scale
Profiling Display

indicates those regions where the 1350 will or will not
produce an audible signal when a target is located.
Where a notch is present (those regions of 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.
Numerical Reference Guide
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.
Profiling Display
Located at the bottom of the LCD screen, the Profiling
Display indicates the size of a target (Small, Medium and
Large).
25
Target ID Guide (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.
Upper Scale
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.
Lower Scale
The Lower Scale, or Notch Discrimination Scale,
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LCD Display

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 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 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
27
Battery
The Battery scale, shown on the bottom, right hand
corner of the LCD screen, indicates the amount of power
remaining in the batteries.
26
Operating Instructions

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 PROFILING feature is
29
about one (1) to two (2) inches above the ground. Do not
allow the searchoil 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 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
searchcoilaninchortwoasyouscanoversuchsoilscan
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.
28

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
toback)usingasmooth,steadyandcontinuous
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. Be sure to maintain a
continuous 14 inch sweep. 31
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).
30 Figure 7
14”

Very large and / or close targets may cause the GTP'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.
33
If the target's Profile (size) consistently displays
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.
32
Overload Audio

The 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,theProfilingDisplaycanaid in the identification
of such targets before you dig.
Rustyirontargetsmaycausejumpy or non-repeatable ID
readings.
35
Pinpoint the target as mentioned in the PINPOINTING
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.
34
Junk TargetsCoin-Depth Measurement

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, pulltabs and bottlecaps. 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
difficultto detectthanitemsburiedovertime. Experiment
with various detection modes and pay close attention to
audio, Target ID and Profiling signals as you scan.
37
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
concentrateonscanning. When you are searching in the
ZERO Discrimination Mode, every metallic target will
produce an audible sound.
36
Test Plot ConstructionField Operation

5. Pass the same metallic targets (as used in 2)
across the bottom of the searchcoil and listen
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 by the
GTP 1350.
7. Experiment with theACCEPT / REJECT
touchpad. Noticewhichofthe24segmentsare
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
Garrett detector to the fullest extent possible,
39
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
theDiscriminationsettings. Thefollowing testsshouldbe
performed as shown below with the searchcoil
perpendicular to a bench, floor or other non metallic
object. 1. SelecttheZERODiscriminationMode. (See
page 14)
2. Pass various metallic objects across the
bottom of the searchoil 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 (See page 14)
4. Press the OPERATE touchpad
38
Bench Testing