Garrett AT PRO INTERNATIONAL User guide

Owner´s Manual AT PRO International

AT PRO INTERNATIONAL Owner´s Manual

DTI Detector Trade International GmbH & Co. KG

AT Pro International™

1

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.
In 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.

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Garrett Metal Detectors

TABLE OF CONTENTS

AT PRO CONTROL PANEL ................................................................... 4

QUICK START GUIDE ........................................................................... 5

AT PRO COMPONENTS ....................................................................... 6

LIST OF PARTS .................................................................................... 7

ASSEMBLY .......................................................................................... 8

POWERING ON .................................................................................. 11

SEARCH MODES ............................................................................... 12

Overview of STD Mode vs PRO Mode ........................................ 12

Standard (STD) Detection Modes ..............................................13

PRO Detection Modes ................................................................ 15

Proportional Audio (PRO Mode) ................................................. 15

Tone Roll Audio (PRO Mode) ...................................................... 18

TARGET ID INFORMATION ................................................................19

DIGITAL TARGET ID ........................................................................... 20

TONE ID ............................................................................................. 21

DISCRIMINATION ..............................................................................22

Notch Discrimination..................................................................22

Iron Discrimination ..................................................................... 24

IRON AUDIO ...................................................................................... 27

SENSITIVITY ...................................................................................... 30

GROUND BALANCE ........................................................................... 31

Automatic Ground Balance ........................................................ 31

Manual Ground Balance ............................................................ 32

FREQUENCY ADJUSTMENT ..............................................................33

PINPOINTING .................................................................................... 34

Narrowing the Detection Area ...................................................36

Coin Depth Indicator ..................................................................36

Alternative Pinpointing Methods ............................................... 37

HUNTING TIPS .................................................................................. 39

BENCH TESTS ................................................................................... 44

UNDERWATER OPERATION .............................................................. 47

CARE AND MAINTENANCE ............................................................... 48

Battery Replacement .................................................................48

TROUBLESHOOTING GUIDE ............................................................. 50

METAL DETECTING CODE OF ETHICS ............................................. 51

CAUTIONS .........................................................................................52

WARRANTY / SERVICE ..................................................................... 53

ACCESSORIES ................................................................................... 54

SUGGESTED READING ..................................................................... 56

AT Pro International™

3

High Resolution

Iron Discrimination

indicates level of iron

discrimination selected.

Mode

Indicator

Sensitivity
Setting

AT Pro CONTROL PANEL

Target ID
Legend

indicates
metal types.

Digital
Target ID

(also shows
ground balance
settings while in
GND-BAL mode.)

Target ID
Cursor

indicates
probable
target identity.

Lower Scale

indicates notch
discrimination pattern.

Coin Depth

Indicator

indicates depth of
coin-sized target.

Iron Disc
Pushbutton

Use (+) or (-) to change
iron discrimination
level.

ON / OFF Power:

to turn power on/off.

MODE:

push quickly to toggle

between detection modes.

RESET:

hold 5 seconds to restore

factory settings.

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Garrett Metal Detectors

Iron Audio

Use to hear
discriminated
iron.

hold 1 second

PINPOINT /
Frequency
Adjust
Pushbutton

Press and hold to
pinpoint or use with
SENSITIVITY (+)
or (-) to change
frequency.

SENSITIVITY

Pushbutton

increases or decreases sensitivity.

Battery Level

Indicator

GROUND BALANCE
Pushbutton

Press and hold for fast auto
ground balance or use with
NOTCH DISC (+) or (-) for
manual ground balance.

ELIM and NOTCH DISC

Pushbuttons

Use NOTCH DISC (+) or (-) to select
a cursor. Then use ELIM button to set
its discrimination on or off.

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.

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 searchcoil to 2 to 3 cm above the ground and
scan the coil left and right at approximately 1m/second.

AT Pro International™

5

AT Pro COMPONENTS

Search

coil

Lower

Stem

Spring

Clip

S-shaped

Stem

Handle

Grip

Upper

Stem

Detector

Stand

Control

Housing

LCD

Screen

Pushbutton

Controls

Arm
strap

Padded

Arm Cuff

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Garrett Metal Detectors

LIST OF PARTS

No tools are required 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
S-shaped stem
 One (1) upper stem and one
(1) lower stem connected
 One (1) wing nut, two (2)
mounting washers and
one (1) threaded bolt

If any part is missing, please contact your local dealer.

 One (1) 28x22 cm DD
searchcoil

 Owner's manual
 Warranty Card
 Headphones













AT Pro International™



7

ASSEMBLY

1. Align the holes in the mounting washers with the
small posts on the lower stem and press firmly into
place.

1. 2.

2. Slide the searchcoil onto the stem.

3. Insert the threaded bolt through the holes of the
lower stem and searchcoil. Hand-tighten the
searchcoil assembly with the wing nut.

3. 4.

4. Depress the spring clip in the S-stem and insert the
control housing into the upper stem.

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Garrett Metal Detectors

5. Depress the spring clip in the lower stem and adjust to
the most comfortable operating length.

5.

6.

6. Wrap the cable snugly about the stem with the
first turn of the cable over the stem.

7. Insert the coil connector into the 4-pin connector of
the control housing and hand-tighten.

7.

8.

8. If needed, adjust the arm cuff by removing the screw
on the bottom and moving it to the other hole.

AT Pro International™

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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.

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Garrett Metal Detectors

POWERING ON

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™

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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 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
target's 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.

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Garrett Metal Detectors

STANDARD (STD) DETECTION MODES

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 regardless 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

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. All 12
discrimination pixels are switched on and High-Res
Iron Discrimination is set to 0 (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

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.

•CUSTOMMode

This mode can be customized by the operator and
the AT Pro will retain the changes when the detector
is switched 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 22–26.)

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Garrett Metal Detectors

PRO DETECTION MODES

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
target’s response. Proportional audio response also allows
the user to better judge a target’s size, shape and depth
and has the additional benefit of faster recovery time for
separating adjacent targets.

AT Pro International™

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Audio Target Response Comparison: Standard vs Pro Mode

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.

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Garrett Metal Detectors