Garrett Sea Hunter Mark II None User manual

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TABLE OF CONTENTS
To the Owner 4
Control Functions 6
Search Modes 8
Assembly 13
Operating Procedure 17
Field Recommendations 18
Search and Recovery Tips 20
Cautions 25
Maintenance 27
Battery Replacement 28
Recommended Accessories 30
Specifications 31
Repair Service 32
Warning 34
Recommended Reading 35
Mind Your Manners 37
RAM Book Order Form 39
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TO THE OWNER
The Garrett Sea Hunter Mark II has an
unparalleled reputation among treasure
hunters, law enforcement agencies and
various industries as one of the most
reliable and sophisticated submersible
metal detectors of its kind.
The Sea Hunter Mark II is an advanced
microprocessor-driven instrument that is
lightweight, highly durable and easy to
use. The Sea Hunter's pulse induction
(PI) circuitry provides excellent depth
and enables you to find treasure without
interference from salt water and most
ground minerals.
OUTSTANDING FEATURES
The Sea Hunter's outstanding performance,
custom-designed housing and multiple
configurations make it superior to
other underwater detectors available.
Microprocessor-based circuitry in the Sea
Hunter provides greater sensitivity, faster
target response and comes with Garrett's
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exclusive Discrete Target Elimination
mode. The custom designed double-
o-ring sealed housing is durable and
lightweight, with individual, o-ring sealed
battery and electronics compartments that
makes battery replacement hassle free.
An 8" epoxy-filled searchcoil and custom
designed headphones, submersible to 200
feet, make the Sea Hunter Mark II highly
stable and reliable.
The Sea Hunter Mark II is very versatile,
offering four stem arrangements to suit
your search needs: the long stem with top
stem mount, under cuff stem mount, hip
mount and the short stem ScubaMate.
Each arrangement allows you the versatility
to search on land, in shallow water or
underwater, or in situations where a sealed
detector is required. The ScubaMate is
ideal for diving while the long stem allows
you to carry the control housing on your
waist or shoulder, or stem mounted, is
useful for searching on land or in shallow
water.
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CONTROL FUNCTIONS
Power - Use to turn the detector on and
choose either of two search modes. A
battery check occurs automatically each
time the power is switched on. (Figure 1)
Threshold - Use to set the base audio
level according to an individual's hearing
ability and how loud the outside noise
is. Typically the sound is set no louder
than necessary, just above silent is
recommended. (Figure 1)
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Figure 1, Panel Face

Elimination - Use in conjunction with
either the Standard or Discrete Trash
Elimination modes to choose the
elimination level appropriate to your
search needs. As the elimination knob is
rotated clockwise, an increasing number
of undesirable items are excluded from
detection. (Figure 1).
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SEARCH MODES
Standard Trash Elimination and Discrete
Trash Elimination are the search modes
available with the Sea Hunter Mark II. The
selector switch for these modes is located
on the right side of the panel.
Standard Trash Elimination is the search
mode normally available on conventional
pulse induction (PI) metal detectors. The
background audio threshold is continuous
and remains close to the operator's
chosen level while responding to ongoing
variations in the detection signal. Small or
deep targets produce faint, weak signals
and large or shallow targets produce
loud, strong signals.
The elimination knob is used to change the
detector's ability to detect various types
of metal. As you rotate the elimination
knob clockwise, the detection response to
metals decreases. The detection response
to poor conductors, such as foil, nickel and
pull tabs decreases significantly more than
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the response to good conductors such as
coins and fine jewelry. In Standard mode,
the response to poor conductors can be
eliminated effectively; however, if these
objects are too close to the searchcoil,
a detection response may occur. The
response to good conductors, although
somewhat diminished, remains relatively
strong. Some jewelry such as rings and
thin gold necklaces are found in the
middle of the conductivity range, so it's
important to dial in only the amount of
elimination needed for the search area.
Standard mode permits a very slow
searchcoil sweep, making it particularly
effective for pinpointing targets. It provides
the deepest possible detection and is
most useful in areas with little trash.
Discrete Trash Elimination is a search
mode exclusive to the Sea Hunter Mark
II. It is similar in operation to detectors
with a Motion Discrimination mode in that
it provides more precise and enhanced
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target discrimination. The background
audio threshold remains at the chosen
level until the searchcoil passes over
targets in the knob's "accept" range,
at which time a sharp audio response,
a characteristic of all motion detectors,
occurs.
Figure 2 shows the typical detection
responses from various metals in both
Discrete (DIS) and Standard (Std) Trash
Elimination modes. Note that in Std 0
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Figure 2

(Standard Mode with elimination at
0) metals can be detected at 100%
capability. As the elimination control is
increased in either search mode, the
response to various targets decreases.
Note that the response to many metals
decreases more rapidly in Standard
mode than in Discrete mode.
As with Standard mode, the elimination
knob is used to change the detector's
ability to detect various types of metal;
poor conductors can be eliminated while
only slightly reducing the detection of
better conductors. Although Discrete
mode appears to achieve less detection
depth in air tests, its ability to eliminate
undesirable items precisely, without
affecting desirable items, enable it to
outperform Standard mode in certain
situations. For example, when the
elimination control is set to exclude pull
tabs, it excludes pull tabs with little or no
effect on the detection response to most
thin gold rings (Figure 2).
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To pinpoint in Discrete mode, you simply
sweep the searchcoil from to side to side
over a target. The searchcoil must remain
in motion to produce a detection response.
This mode is designed to provide superior
pulse induction target discrimination and
is extremely effective in areas with lots
of trash.
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ASSEMBLY
1. Choose a desired operating / stem /
control housing configuration. Assemble
the stem and attach the control housing
as desired. (Figure 3,4,5).
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Figure 3, ScubaMate
Figure 4, Full length with undercuff

Figure 5, Long stem with hip mount configurations
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2. Attach the searchcoil to the lower
stem. Align the mounting holes of the
searchcoil and stem, insert the threaded
bolt through the holes and hand-tighten
the knobs; Do Not use tools. (Figure 6)
3. Wrap the cable around the stem
and secure it according to your
operating configuration. For a hip mount
configuration, use the adjustable strap to
secure the cable to the upper stem.
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Figure 6, Parts needed to assemble stem and searchcoil

4. Ensure the searchcoil connector at
the rear of the control housing is clean
and the o-ring is well lubricated; add a
little silicon grease or petroleum jelly if
necessary. Do not coat connector pins
with lubricant. Insert coil connector and
gently hand tighten. Do not over tighten.
5. Repeat Step 4 when assembling the
headphone connector at the front of the
control housing.
6. Perform a battery test by switching on
the detector, noting the number of beeps
that occur. Scan a metal object to confirm
detection. If the batteries are low or the
detector fails to operate, verify that the
battery pack and batteries are aligned
properly.
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OPERATING PROCEDURE
1. Switch on the detector and note the
results of the battery test represented by
a range of one to four beeps. Four beeps
indicate the batteries are full, one beep
indicates they must be replaced.
2. Select the Standard or Discrete Trash
Elimination mode.
3. Set the threshold knob to the desired
audio level. Typically the audio is set very
low; usually just above silent. How low
you set it depends on your hearing needs
and how loud the background noise is.
4. Set the elimination control to zero
or a low level until you examine your
search area and determine the kinds of
metal items you want eliminated from
detection. Then re-adjust it to a level that
maximizes your search goals.
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FIELD RECOMMENDATIONS
Knowing the conditions of your search
and which items you want, or don't want,
to find will help you choose the search
mode and elimination setting which best
suits your needs.
Depending on your search goals, you
may want to set the elimination no higher
than necessary so that you can detect
most metals. You may even want to set
the elimination at zero so there is no
discrimination and all metals are detected.
Although you'll detect a lot of undesirable
items like foil and pull tabs, you won't
miss any desirable ones.
Methodically sweep the searchcoil
from side to side keeping it one or two
inches above the surface. Restrict your
sweeping speed to about one to two
feet per second. Overlap each sweep
by advancing the searchcoil by at least
a quarter of its diameter; one half is
recommended. Always scan in a straight
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line (not a wide arc); it helps keep the
searchcoil level, reduces the likelihood of
lifting the searchcoil at the end of each
sweep and ensures the overlap sweeps
remain uniform.
Finally, it is important to remember that
any detection signal, no matter how
loud or faint, represents the sound of
metal and its source should always be
determined.
As with all PI detectors, eliminating iron
materials while in either mode is difficult
if not impossible. However, attaching a
magnet to the inside of your digging tool
can help separate bits of iron and other
debris from your treasure finds.
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SEARCH & RECOVERY TIPS
Treasure Hunting
Research - The first rule of successful treasure
hunting, whether on land or in the sea is to do
your homework. Learn as much as you can
about the areas you want to search, the kind
of treasure you want to find and the best ways
to recover it. The better prepared you are the
greater your chances for success. The following
books by Charles Garrett, available from Garrett
Metal Detectors, or your local Authorized Garrett
Dealer, offer invaluable research, advice and
detailed information on search and recovery
techniques for hobbyists: How to Search Sand
and Surf;Treasure Hunting for Fun and Profit
and New Successful Coin Hunting.
Search popular gathering places - Survey the
beach to determine areas with lots of people
activity. A wealth of treasure, including lost
coins and jewelry, often lies hidden beneath
the sand. Other areas that can yield treasure
include footpaths, scenic spots, picnic or camp
sites, concession stands, dressing cabins,
water fountains, boat docks, boardwalks, sea
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