Coinmaster GT
®
White’s Electronics, Inc.
Sweet Home, Oregon USA
Building the World’s Finest
metal detectors for over 60 years.
Coinmaster GT
Owner’s Manual
CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
QuickStart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Controls
On/Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Disc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Tone ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Trac Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Beach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pinpoint/All Metal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
More Info
VDI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Depth & Discrimination . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Coil Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Sweep Methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Sizing, Pinpointing, & Digging . . . . . . . . . . . . . . . . . . . . 13
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Customer Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Code of Ethics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Back Cover
Page 2
Coinmaster GT
Low battery
indicator
Backlight
indicator
Sensitivity
strength
Tone ID mode
indicator
Disc cursor
Reject icons
Depth bar
Numeric VDI
and depth
Owner’s Manual
Introduction
The Coinmaster GT (or CoinGT) is an easy-to-use metal
detector with features and performance that rival more expensive models. The CoinGT has automatic ground tracking (Auto-
Trac®) which maximizes performance across many different
ground conditions. It also features a 9-zone discriminator with
both audio and visual target identification. Each zone may be
accepted or rejected, providing the user with a way to ignore
certain types of targets like iron or foil.
In normal search mode (i.e., “Disc” mode) the audio has a
silent threshold and optional Tone ID with 9 tones that correlate
to the 9 different discrimination zones. In addition to the audio
response, the display provides visual information with an icon
cursor that points to a probable target type and a Visual Display
Indicator (VDI) number that provides even more detailed target
information (see More Info for an explanation of VDI numbers).
An estimated target depth is given by the depth bar. The Pinpoint and All Metal modes provide an audible threshold tone
and a user-selectable VCO response or a loudness response
(non-VCO).
The CoinGT uses 8 “AA” batteries and will typically run 25
hours on fresh alkaline batteries. The display includes an
optional backlight which allows for extended hunting, but will
increase battery consumption.
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Coinmaster GT
Assembly
Owner’s Manual
1. Remove all parts from the shipping carton and check assem-
bly diagram to ensure all parts are present.
2. Install black rubber washers on fiber clevis/lower rod, insert
clevis lower rod onto loop ears. Use only nonmetallic washers, fiber bolt, and fiber thumb nut to secure loop/search coil
to clevis/lower fiber rod.
3. Insert clevis/lower rod into curved “S” rod so that stainless
steel spring clip buttons line up and lock into one of the
adjustment holes in the curved “S” rod. The second or third
adjustment holes are suitable for average sized adults.
4. Wind the loop cable around the rod assembly, first revolu-
tion over the top of the rod, all the way to the top of the
curved “S” rod, about five revolutions. Use the black cable
retainers, one near the loop, and one near the top of the
curved “S” rod, to hold the loop cable in place. Plug the
cable into the jack on the front of the control box.
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Coinmaster GT
5. Grip the instrument by the handle, with your arm in the
elbow cup with strap and sweep the loop/search coil over
the floor. If the instrument fit feels uncomfortable, readjust
clevis/lower rod length with spring clip button and cam-
lock so that search coil can be held near the floor without
stooping over.
6. Adjust the elbow cup strap so that it is loose enough for you
to slide your arm in and out without loosening each time
you want to set the detector down. The elbow cup strap pro-
vides extra leverage and control. However, some prefer not
to use it.
7. Install the battery pack.
Owner’s Manual
Batteries
1. Remove the battery pack by pressing both buttons on sides
of battery compartment.
2. Slide open the tray cover. Install eight (8) “AA” alkaline
batteries taking note of correct (+) and (-) positions and
close cover.
3. Slide battery pack into compartment. A vigorous ‘slam’
may be needed to ensure a good seating.
4. Press ON/OFF button. Good batteries will produce a high
pitched beep on power-up. A low pitched beep indicates
low batteries.
5. Batteries that are weak, or become weak during use, will
automatically indicate Low Batt with a battery icon on the
center portion of the display. A three-beep alarm also
sounds to indicate batteries are too low for operation.
6. Most alkaline batteries will give about 25 hours of continu-
ous operation. Battery life will vary with intermittent use,
back-light use, temperature, control settings, target indica-
tions, battery quality, battery condition upon purchase, and
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Coinmaster GT
shelf life. It is a good idea to carry back up batteries.
7. A rechargeable NiMH battery pack may be purchased sepa-
rately. Rechargeable batteries typically provide similar or
slightly less run time than alkaline batteries.
Owner’s Manual
QuickStart
1. Turn on the power.
2. The CoinGT has automatic ground tracking. To speed up
the initial tracking process, find a spot free of targets and
bob the coil up & down a few times (optional).
3. Sensitivity (SENS) defaults to a reasonable level. If the
audio is chattery or constantly overloads, reduce the sensitivity level.
4. Sweep the search coil from
side-to-side, keeping the coil
level and close to the ground.
Overlap each sweep by 50%
to avoid missing targets.
5. Once a target is detected, use
the Pinpoint button to isolate
its exact location.
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Coinmaster GT
Owner’s Manual
Controls
ON/OFF
Besides the obvious, the ON/OFF button also controls the
display backlight. Press and hold the button to toggle the backlight.
SENS
The Sensitivity control increases or decreases the responsiveness of the CoinGT. Normally, this determines how deep the
detector will “see” a target.
However, increasing the sensitivity not only increases the
response to target signals, but also that of ground signals and
electromagnetic interference (EMI). A common mistake is to
assume that higher sensitivity will always give better depth. In
air tests this is generally true, but ground results can depend on
the amount and type of mineralization.
In general, run the sensitivity as high as possible while
maintaining smooth operation. If the audio is chattery or the
ground is causing overload, reduce the sensitivity.
DISC
The Discrimination control allows you to enable or disable
the audio response for select ranges of targets. The CoinGT has
9 ranges:
1. Small iron
2. Large iron
3. Foil
4. Nickel
5. Pull tab
6. Zinc cent
7. Copper cent
8. Small silver
9. Large silver
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Coinmaster GT
Owner’s Manual
Use the circular arrow button to cycle the disc cursor
through the 9 ranges, and press the disc select button to
toggle the selection of a particular range. The range is disabled
when the symbol is displayed.
TONE ID
By default the CoinGT has a single tone audio response
regardless of the type of target. Pressing the TONE ID button
enables a multi-tone audio response whereby each of the 9 target zones has a different audio tone. When Tone ID is enabled a
“TONE ID” icon will appear on the display.
TRAC LOCK
The CoinGT has automatic ground tracking (AutoTrac®)
which effectively nulls most ground mineralization. If the audio
is chattery and reducing sensitivity doesn’t help, lock the
ground tracking with the Trac Lock button. Pressing Trac Lock
again immediately updates the ground tracking and returns to
AutoTrac® mode.
BEACH
Wet salt sand (and sometimes highly fertilized ground) is
mildly conductive and difficult for most metal detectors. The
Beach mode expands the ground tracking range of the CoinGT
to handle wet salt sand. You may still need to use a slower
sweep rate to avoid falsing. This mode is not recommended for
normal soils and may cause some targets to track out. Also generally not needed for dry beach sand.
P/P (ALL METAL)
The Pinpoint (P/P) button performs two functions. When
briefly pressed it switches the CoinGT in and out of “All Metal”
mode. Discrimination is not applied in the All Metal mode and
the CoinGT will respond to any metal target. However, Target
ID (both the VDI number and the icon cursor) and Depth indication work the same in All Metal mode as in Disc mode. Also
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Coinmaster GT
like Disc mode, the All Metal mode requires that the coil be in
motion in order to respond to a target. If the coil is held steady
over a target it will get tuned out after a few seconds.
When the Pinpoint button is pressed and held it performs
the second function of enabling Pinpoint mode, which is typically used to assist in pinpointing a detected target. Pinpoint
mode is a true static mode in that audio response is maintained
as the coil is held steady over the target.
In both All Metal and Pinpoint mode a threshold audio is
applied and a target will cause the loudness to increase. The
CoinGT also supports VCO1 audio whereby a target causes the
pitch of the threshold to increase. VCO audio is enabled by
pressing the Tone I D button while in Pinpoint mode.
Owner’s Manual
Display
The CoinGT display provides information on the operation
of the detector as well as the detected target. On the right is the
segmented bar which shows the sensitivity level. On the left is
another segmented bar which shows the estimated target depth
in increments of 2”. A “TONE ID” icon indicates that multitone audio is enabled. A low-battery icon will appear when battery voltage falls below about 9 volts.
A large 2-digit number gives the VDI response of the target
in both Disc and All Metal modes and the depth of the target in
Pinpoint mode. VDI responses are covered in the “More Info”
section. The numeric depth is given in 1/2” increments with no
decimal point. Therefore, a depth readout of “50” is 5 inches,
and a readout of “55” is 5.5 inches.
Across the top of the display are the segments for the 9 discrimination zones. When a target is detected a pointer/cursor
points to the zone that corresponds to the type of target. Additionally, these zones can be disabled (rejected) by using the
Disc keypad buttons to move the cursor and select/deselect each
1. “VCO” means voltage-controlled oscillator
Page 9
VDI SCALE
HOT ROCK
DOLLAR
HALF / LG
QUARTER
DIME
+95
90
85
80
75
70
65
60
55
S
I
L
V
E
R
ZN CENT
CENT
CU-NI CENT
PULL TAB
SQ TAB
NICKEL
FOIL IRON
SALT
NAILS
LG IRON
C
U
G
O
L
D
F
E
R
R
O
U
S
50
45
40
35
30
25
20
15
10
5
0
-10
-20
-95
SILVER RING
c
LATE CENT
-40
-60
-90
EARLY CENT
GOLD RING
$2.50 GOLD
$5 GOLD
SC CAP
SM NUGGET
LEAD
MINIE
Coinmaster GT
Owner’s Manual
zone. Rejecting a zone only affects the audio; the display will
still show target information even if you can’t hear an audible
response.
The CoinGT display includes a backlight for extended hunting. Press and hold the On/Off button to toggle the backlight. In
daylight it can be difficult to tell whether the backlight is on or
off, so a backlight icon is also displayed. The backlight will
reduce battery life by 30% so it’s best to turn it off when not
needed.
More Info
VDI
VDI stands for Visual Display Indicator and is a numeric representation of
the target’s response. So-called VLF
detectors transmit a magnetic field
which is disrupted by nearby metal targets. The disruption is seen by the
receiver as an increase in signal amplitude (which gives a basic “I found
something!”) but also creates a signal
phase shift. This phase shift usually
indicates the type of target and can be
used both for identifying targets and for
discriminating or rejecting them.
+95, where negative numbers correspond to ferrous (iron) targets and positive numbers to non-ferrous targets. A
chart of typical VDIs is shown on the
right.
gets. For example, due to the variety of
sizes and alloys, gold rings can give the
White’s uses a VDI scale of -95 to
There is a lot of overlap amongst tar-
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Coinmaster GT
Owner’s Manual
same responses as foil, nickels, and pull tabs. Likewise, pull
tabs often look like nickels and vice-versa.
Target ID is by no means foolproof and should be considered only a probability estimate. As we’ll see in the next section, the probability decreases with depth. An excellent
approach is to work with test targets (especially planted at different depths) to get familiar with target responses.
Depth and Discrimination
The CoinGT has both audio and visual target ID, as well as
the ability to reject certain ranges of targets. It is important to
understand the limitations of target ID — and, because it is
based on target ID, discrimination — to avoid missing good targets.
As explained in the section on VDI, target ID is based on
the phase shift of a target’s received signal. We’ve already seen
that many different types of targets can share VDI responses.
Depth also plays a role. A strong target signal (either from a
shallow target or a large target) provides for a strong and repeatable phase response from which we can extract a pretty reliable
VDI. As the target signal weakens, its VDI becomes less reliable. This can show up as an inconsistent target response as the
coil is repeatedly swept over the target. It is not unusual for
deep targets to produce an inaccurate target ID, and perhaps
even cross over into a rejected zone.
Furthermore, ground mineralization can cause errors in target phase. Even targets of moderate depth can produce an inaccurate target ID if ground mineralization is severe enough.
Reliance on target ID should be tempered, and discrimination should be used with care. A “test garden” with multiple
types of targets buried at various depths is a good way to see
how target responses behave and to hone your skills in reading
these responses.
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Coinmaster GT
Owner’s Manual
Overload
If the received signal is too large to process the CoinGT will
give an overload response. This is heard as an obnoxious alarm
sound, plus the display will read “OL”. An overload can be the
result of a large metal target near the surface, or from extreme
ground mineralization. If it is the latter, the only recourse is to
reduce the sensitivity level until the detector can operate
smoothly.
Coil Size
With any metal detector, the size of the search coil presents
a trade-off between depth and sensitivity. A larger coil offers
better depth on larger targets at the expense of small-target sensitivity, and a smaller coil has better sensitivity to small targets,
but at a lesser depth. Small coils also do a better job of separating targets when hunting in trashy areas.
The CoinGT comes standard with a 9” concentric coil. An
optional 4x6 “DD” coil is also available.
Sweep Methods
Proper sweep technique is
important with any detector.
Round coils tend to have a
conical pattern of sensitivity
as illustrated here. As such,
coverage at maximum depth
is less than the size of the coil,
so it is always recommended
that successive sweeps are
overlapped by about 50%.
Besides overlapping each sweep, it is important to keep the
coil close and parallel to the ground. Pendulum-swinging the
coil results in loss of depth, and if the ground balance isn’t perfectly set the variation in loop height will create a ground
response. The following illustration shows improper and proper
coil sweep motion.
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Coinmaster GT
Wrong Right
Owner’s Manual
Finally, sweep speed affects target response and depth.
Some detectors are designed for an exceptionally slow sweep
speed, some need a fast sweep. The CoinGT works best at a
moderate rate of about 3 feet per second. Somewhat slower or
somewhat faster is fine, but whipping the coil at a fast rate is a
good way to miss deeper targets. The bottom line is: swing
level, moderate speed, and overlap.
Sizing, Pinpointing, and Digging
When a target is detected move the coil well away from the
target area and press/hold the Pinpoint button to switch to the
Pinpoint mode. A normal sweep over the target in Pinpoint
mode will give an idea of target size. If the response is narrow
then it is likely a small coin-sized target. If the response is broad
then it could be e.g. a beer can. Small shallow targets can give a
broad response, and large deep targets can give a narrow
response, so use judgement with this.
Once you determine you want to dig a target, use the Pinpoint mode to zero in on the location. A criss-cross pattern
works best, especially using VCO audio to listen for the peak
tone. Watch the ground through the open coil to better determine the exact spot.
Be mindful of proper digging techniques when extracting
the target. Use the smallest appropriate digging tool, especially
in public areas. Learn how to cut plugs that avoid turf damage
or, better yet, how to “pop” coins. There are lots of videos on
YouTube that demonstrate good extraction protocol.
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Coinmaster GT
Owner’s Manual
Specifications
Operating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VLF-IB
Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.192kHz
Search modes . . . . . . . . . . . . . . . . . . . . . . . . . .Disc, All Metal
Ground balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AutoTrac
Disc Audio . . . . . . . . . . . Silent search with (optional) 9 tones
All Metal Audio. . . . . . . . . . . . . . VCO or non-VCO, selectable
Audio output . . . . . . . . . . . . . . . . . . . . .Speaker, headphones
Search coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9” Concentric
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 lbs 9 oz
Length. . . . . . . . . . . . . . . . . . . . . . . .45 - 50 inches, adjustable
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (8) AA alkaline
Battery life . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 hours typical
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . 2 years, transferrable
Customer Support
Questions concerning your CoinGT? There are three ways to
contact us:
Internet: http://whiteselectronics.com/support.html
Phone:
1-800-547-6911 (US) (0044) 1463 223456 (UK)
Or mail us:
White's Electronics White's Electronics
1011 Pleasant Valley Road 35 Harbour Road
Sweet Home, OR 97386 Inverness, Scotland
IV1 1UA
Page 14
Coinmaster GT
Owner’s Manual
Warranty
If within two years (24 months) from the original date of purchase, your
White’s detector fails due to defects in either material or workmanship,
White’s will repair or replace at its option, all necessary parts without charge
for parts or labor.
Simply return the complete detector to the Dealer where you purchased
it, or to your nearest Authorized Service Center. The unit must be accompanied by a detailed explanation of the symptoms of the failure. You must provide proof of date-of-purchase before the unit is serviced.
This is a transferable manufacturer warranty, which covers the instrument two years from the original purchase date, regardless of the owner.
Items excluded from the warranty are non-rechargeable batteries, accessories that are not standard equipment, shipping/handling costs outside the
continental USA, Special Delivery costs (Air Freight, Next Day, 2nd Day,
Packaging Services, etc.) and all shipping/handling costs inside the continental USA 90 days after purchase.
White’s registers your purchase only if the Sales Registration Card is
filled out and returned to the factory address by your dealer, soon after original purchase for the purpose of recording this information, and keeping you
up-to-date regarding White’s ongoing research & development.
The warranty does not cover damage caused by accident, misuse,
neglect, alterations, modifications, unauthorized service, or prolonged exposure to corrosive compounds, including salt. Duration of any implied warranty (e.g., merchantability and fitness for a particular purpose) shall not be
longer than the stated warranty. Neither the manufacturer or the retailer shall
be liable for any incidental or consequential damages.
Some states however, do not allow the limitation on the length of
implied warranties, or the exclusion of incidental or consequential damages.
Therefore, the above limitations may not apply to you. In addition, the stated
warranty gives you specific legal rights, and you may have other rights
which vary from state-to-state.
The foregoing is the only warranty provided by White’s as the manufacturer of your metal detector. Any “extended warranty” period beyond two
years, which may be provided by a Dealer or other third party on your detector, may be without White’s authority involvement and consent, and might
not be honored by White’s Electronics, Inc.
Page 15
Coinmaster GT
®
Owner’s Manual
Coinmaster GT
Treasure Hunter’s Code of Ethics
1. Always check federal, state, county, and local laws
before searching.
2. Always obtain the owner’s permission before accessing private property.
3. Take care to refill all holes and leave no trace.
4. Remove and dispose of any and all trash and litter
found.
5. Whenever possible, return identifiable property to its
rightful owner.
6. Never destroy historical or archaeological treasures.
7. Appreciate and protect natural resources, wildlife and
property, both public and private.
8. Act as an ambassador for the hobby; be thoughtful,
considerate, and courteous at all times.
White’s metal detectors are proudly designed,
built, and tested in Sweet Home, Oregon USA
by the employees of White’s Electronics.
Part Number 621-0535 — V1.1
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