Garrett GTI 2500 User manual

SPECIAL NOTICE
The Garrett GTI™2500 metal detector
with TreasureVision® and Graphic Target
Analyzer™truly adds a new dimension to
treasure hunting. A precision electronic
instrument that utilizes the miracles of
high technology in its PowerMaster™DSP
circuitry to help locate coins, jewelry,
gold nuggets or any other kind of metallic
object, the GTI 2500 will accomplish more
than any other detector manufactured.
The patented Digital Signal Processing™
(DSP) technology provides extremely accu-
rate multiple channel filtering, continuous
adaptivity to hunting speeds and auto-
matic ground tracking to provide supe-
rior depth, discrimination and pinpointing
performance. Deepseeking sensitivity and
precise discrimination enable this marvel-
ous instrument to identify targets by size
as well as conductivity and to report depth
of targets of any size not just coins. In fact,
the detector's amazing TreasureVision on
the Display Screen will indicate both target
size and depth.
Graphic Target Imaging 2500 - 3

This exciting One-Touch™metal detector is
automatic and surprisingly easy to operate.
Yet those who have special demands will
find the GTI 2500 meticulously adaptable
to any personal style of treasure hunting.
Microprocessor-controlled circuitry truly
makes this the deepest-seeking detector
known to man.
Although the GTI 2500 is built to with-
stand rugged treatment outdoors while
giving years of trouble-free service, always
remember that this detector is a preci-
sion electronic instrument. Protect it from
extreme heat and cold as well as mist,
rain or blowing sand. Keep it as clean as
possible.
4 - Garrett Metal Detectors

CONTENTS
To The Owner ..............................7
Assembly .....................................9
Touchpads ......................................13
Display Screen ................................ 18
TreasureVision ................................20
Basic Hunting Instructions ................ 23
Discriminate Mode ...........................29
Setting Discrimination (Notches)....... 34
Operating Settings...........................39
Search Aids .................................... 45
Audio Choices ................................. 47
Battery Choices...............................48
All-Metal Mode ................................49
Other Special Features in
the All-Metal Mode ....................52
Treasure Imaging ........................... 57
Bench Testing .................................64
Field Operations .............................. 66
Headphone Jack ..............................75
Searchcoils .....................................76
Battery Information ......................... 77
Recommended Accessories ............... 81
Maintenance ...................................82
Specialized Hunting ......................... 83
Repair Service................................. 90
Recommended Reading....................... 93
Graphic Target Imaging 2500 - 5

Warning................................................. 95
RAM Book Order Form .................... 97
Specifications ................................ 99
Code of Ethics ............................... 101
Patents .......................................... 103
6 - Garrett Metal Detectors

TO THE OWNER
As the proud owner of a Garrett GTI 2500
with TreasureVision and Graphic Target
Analyzer, you join a worldwide fraternity
of treasure hunters who use Garrett detec-
tors to find coins, jewelry, relics and gold
nuggets worth millions of dollars.
This manual describes basic functions of
the GTI 2500 and explains how its target
identification and sizing, deepseeking and
discrimination capabilities can find trea-
sure. Your GTI 2500, whose microproces-
sor-controlled circuitry has been acclaimed
and proven through countless hours of
field use, is unparalleled in the simplicity
of its ability to locate coins, jewelry and
other metallic objects. You will be able to
identify the size and depth of any target
you locate.
The GTI 2500 offers dedicated metal
detector hobbyists added depth with a
true All-Metal (Deepseeking) mode and
the adjustment precision available only
with computerized controls. Just touch the
POWER touchpad and begin hunting imme-
Graphic Target Imaging 2500 - 7

diately without interference from ground
minerals. As the world's most intelligent
detector, the GTI 2500 is preset at the
factory to begin operations automatically
in a Coins detection mode. Of course, you
can easily adjust the instrument to oper-
ate in other Discriminate modes or in the
All-Metal mode.
When you find a target, Garrett's revolu-
tionary GTA display instantly directs you
to the range of targets on the Target ID
Guide. Press the TREASURE IMAGING pad
to discover its exact location, size, depth
and as well as clues to its identity. To pros-
pect for precious metals or hunt for deeply
buried caches switch to the All-Metal mode
and Fast Track™will ground balance the
circuitry of your detector precisely and
immediately.
Welcome again to the Garrett treasure
hunting fraternity. In becoming a part of
this great tradition, you follow the route of
multitudes of successful treasure hunting
hobbyists. Now, find your own treasures
with one of the world's most capable and
universal metal detectors, yet one that is
amazingly easy to operate!
8 - Garrett Metal Detectors

Graphic Target Imaging 2500 - 9
ASSEMBLY
Your GTI 2500 is shipped complete in one
carton:
A. Control Housing
B. Upper & Lower Stems
C. 9.5” PROformance Imaging Searchcoil
D. Parts Envelope
E. Owner’s Manual and DVD
F. Warranty Registration Card
Make certain all of these parts are included
and are undamaged. Report any short-
ages or damages to your dealer immedi-
ately. Follow these assembly instructions.
No tools are required. Hand pressure will
be satisfactory for all tightening. Inspect
contents of the clear plastic envelope.
A
B
C
DE
F

10 - Garrett Metal Detectors
A. One (1) nut
B. One (1) threaded bolt
C. Two (2) washers
1. Attach the lower stem to the 9.5” imag-
ing searchcoil. Make certain that the two
rubber washers are inserted onto the
lower stem (see below) before slipping the
searchcoil onto it.
AB
C

Graphic Target Imaging 2500 - 11
2. Place the threaded bolt through the
holes in the connector and hand-tighten
using the remaining wing nut (above left).
Use no tools.
3. Depress buttons in the Control Housing
stem and slide on the Upper Stem.
4. Depress the buttons in the Lower Stem
and insert it into the Upper Stem (above
right). Buttons will pop into the holes, and
you can achieve the desired stem length.
The third set of holes from the end is most
commonly used.
5. As shown, wrap searchcoil cable securely
around stem and connect to detector. The
first cable turn goes over the top of the
stem. The cable should be snug but still

12 - Garrett Metal Detectors
slightly loose (above left) so that the angle
of the searchcoil can be changed easily, if
required. Insert the cable connector into
the connector on the control housing as
shown (above right) and rotate the collar
clockwise until secure (approximately four
(4) turns). Hand tighten only.
Your GTI 2500 is shipped with eight (8) AA
batteries installed and is ready to use.

Graphic Target Imaging 2500 - 13
TOUCHPADS
Power
Turns detector ON and OFF; Returns the
detector to factory settings.
Menu/Scroll
Allows the operator to scroll through the
following settings to make adjustments or
turn them ON or OFF. The scrollable selec-
tions vary whether you are in Discriminate
(see A) or All-Metal (see B) mode.
A. If you are in the Discriminate Search
Mode, your setting choices with the Menu/

14 - Garrett Metal Detectors
Scroll button are: 5 selectable Discriminate
Modes (use the + or - keys to select either
Coins, Jewelry, Relics, Zero or Custom
mode); Sensitivity; Threshold; Frequency;
Volume; Tone; Search Aids (choose either
Search Image, Surface Elimination or Salt
Elimination); Audio (choose either Belltone
or Bi-Level); and Rechargeable (battery).
B. If you are in the All-Metal Search
Mode, your setting choices with the Menu/
Scroll button are: Manual Ground Balance;
Sensitivity; Threshold; Frequency; Volume;
Tone; Search Aids (choose either Auto
Track or Search Image); and Rechargeable
(battery).
All-Metal (Fast Track)
Press and release to activate the All-Metal
(Deepseeking) mode; press and hold to
activate Fast Track ground balancing func-
tion.
Accept / Reject
Functions in the Discriminate modes only;
permits acceptance or rejection of specific
target segments shown on the Lower Scale
to establish discrimination notches.

Graphic Target Imaging 2500 - 15
Treasure Imaging (Pinpoint)
When pressed and held, activates the
automatic pinpointing function in either
mode with signal strength shown on Upper
Scale, depth of target on Lower Scale and
size and depth of target on the Imaging
Grid.
Operate
Returns to operate (hunting) mode after
any change or adjustment of controls.
Discriminate (Last Mode)
When hunting in a Discriminate mode,
returns detector to the previous
Discriminate mode (Coins, Jewelry, Relics,
Zero, Custom) that was being used. When
hunting in the All-Metal mode, press-
ing this button activates the Discriminate
mode that was last being used.
Backlight
Press and release to switch the backlight
on and off. Use the GTI 2500's backlight in
low light situations to illuminate the LCD
screen for improved visibility and target
information.

16 - Garrett Metal Detectors
+ & -
These touchpads permit precise regulation
of the GTI 2500.
You will note that on certain Menu adjust-
ments each press of a touchpad causes
segments on the Lower Scale to move
rather rapidly either to the right (+) or to
the left (-). After 20 movements on the
Lower Scale, an Upper Scale segment will
move. This operation is similar to that of
the decimal system.
The (+) and (-) touchpads enable the fol-
lowing regulation:
• Permit alternation between the five
Discriminate search modes.
• Permit adjustment of levels of Sensitivity
(Depth), Threshold, Frequency, Volume
and Tone and in Discriminate and All-Metal
modes; Surface Elimination in Discriminate
mode; and Auto Track in All-Metal mode.
• Activate (+) or turn off (-) Salt
Elimination, Belltone and Bi-Level target
audio in Discriminate mode.

Graphic Target Imaging 2500 - 17
• Activate (+) or turn off (-) the Search
Image and the Rechargeable battery
gauge in either mode.
• Move cursor in the Upper Scale when dis-
crimination is being set in the Discriminate
mode.
• Permit adjustments to be made that
achieve precise manual ground balance in
the All-Metal mode.
Experiment with these touchpads your-
self and experience the precise degree of
regulation possible with the GTI 2500.

18 - Garrett Metal Detectors
DISPLAY SCREEN
The complete operating status of your
detector is shown on the screen at all
times. When the TREASURE IMAGING
(automatic pinpointing and sizing) touch-
pad is pressed and held, size and depth
of targets will also be shown. The mode
in which you are searching will always be
shown on the left side of the screen under
the SEARCH MODE heading.
The word MENU, SEARCH or IMAGE is
shown at the top of the screen in its center
to indicate detector status. MENU is shown

Graphic Target Imaging 2500 - 19
when the detector is being regulated.
SEARCH will be illuminated whenever you
have pressed the OPERATE touchpad and
are hunting, and IMAGE when you press
and hold the TREASURE IMAGING touch-
pad.
On the second line are the detector func-
tions that you can regulate as desired:
Sensitivity, Threshold, Frequency, Volume
and Tone. When one of these functions
has been illuminated by use of the MENU/
SCROLL touchpad, it can be regulated by
pressing the (+) or (-) touchpads.
Current status of the various Search Aids
that you have selected will always be
shown on the right side of the screen
under the SEARCH AIDS heading.

20 - Garrett Metal Detectors
TREASURE VISION
TreasureVision permits your GTI 2500's
Display Screen to present Imaging by
Garrett. Experience with TreasureVision
will enable a hobbyist to identify targets to
an amazingly precise degree before they
are recovered.
Target ID Guide
This guide printed above the screen show-
ing coin denominations, gold, silver and
other typical metallic objects is designed
to relate location of the Target Cursor with
the Imaging Grid to help identify discover-
ies. Note the five letters (A,B,C,D,E) on