Garrett Metal Detectors SEA HUNTER MARK ll User Manual

OPERATING INSTRUCTIONS:

SEA HUNTER MARK ll

The Sea hunter Mark ll is an extremely versatile detector, offering four (4) mounting/stem
arrangements to suit your search needs.

• Long stem with the housing mounted above the stem.

• Long stem with the housing mounted below the cuff assembly.

• Short stem with mounting as above for diving.

• Belt mounting leaving the stem free of housing. This may be used with either stem

configuration.

ASSEMBLY INSTRUCTION

Choose the desired operating stem/housing configuration and assemble the stem.

1. Compress the button ends of the spring clip and insert, button end first, into the lower stem
of the detector so that the button ends pop out of the holes. This will enable the lower stem
assembly to be attached to the upper stem and the over all length of the detector adjusted
for a comfortable operating length.

2. Attach the lower stem to the searchcoil by inserting the two rubber washers into the stem
and slipping the searchcoil onto the stem. Insert the threaded bolt through the holes and
hand-tighten the two knobs.

3. Install the upper stem to the lower and adjust for the most comfortable operating length.

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

5. Insert the cable connector into the connector on the detector housing and
securely. Do not over tighten. Ensure that the searchcoil connector is clean and the o-ring
is lubricated. If necessary use a very small amount of silicon grease or petroleum jelly. Do
not coat the connector pins with lubricant.

6. Perform a battery test by turning the detector on. Note the number of audio tones that
occur. Pass a metal target such as a coin beneath the searchcoil to confirm metal
detection.

CONTROL FUNCTIONS

Familiarize yourself with the detectors controls. Their basic functions are given here. How
they can help you find treasure is explained in the Operating Instructions of this Manual.

Power/ Depth:

• Turns the detector on. The batteries are checked automatically and audibly each time

the detector is turned on.

• Turns the detector off.

• Selects either of the two (2) search modes.

hand-tighten

Raise searchcoil approximately one foot above the ground. Rotate this knob to turn the
detector on and the detector begins operating. Each time the detector is turned on the battery
condition is reported audibly. Three or more tones indicate the batteries are very good, two
tones indicate the batteries are adequate. One tone or no tone indicate the batteries need to
be replaced.

Audio:

This control on the lower left of the detector panel allows the operator to adjust precisely the
level of sound generated by the detector. It is suggested that this sound level be adjusted to a
threshold level where it is barely audible when searching.

Elimination Control:

Located on the upper left of the detector faceplate panel. Used with either of the two Trash
Elimination modes to choose the level of trash rejection appropriate to your search needs. As
the control knob is rotated clockwise more items are eliminated from detection.

Headphone Jack:
Located on the upper right of the detector panel. Underwater headphones are included with
the detector.

SEARCH MODES

Standard Trash Elimination and Discrete Trash Elimination are the search modes available on
the Sea Hunter Mark ll. The selector switch for these modes is included with the Power Control
on the lower right of the detector panel.

Standard Trash Elimination:

This is the search mode normally available on conventional pulse induction (PI) detectors. In
this mode the background audio threshold is continuous and remains close to the level
established by the operator. Some slight variation of the audio level is normal. Small or deep
targets produce faint and weak signals; large or shallow targets produce loud, strong audio
signals.
The Elimination Control, as rotated clockwise, decreases the detectors response to metals
discovered. Poor conductors such as foil, nickel, and pulltabs are eliminated from detection
much lower on the scale than good conductors like coins and most jewelry. Poor conductors
can be effectively eliminated from detection, however some response may be heard if these
items are near the searchcoil during your search. Jewelry is generally located in the middle of
the conductive range so it is important to use no more trash elimination than necessary. Most
successful detectorists accept all targets of the conductivity of a US nickel or better. Trash
items can always be discarded when the hunt is over.
The Standard Trash Elimination mode permits a very slow scan speed that makes it
particularly effective for pinpointing targets. This mode also provides the deepest possible
detection depth and is most useful in areas with little trash.

Discrete Trash Elimination:

This search mode is exclusive to the Sea Hunter Mark ll. It is similar in operation to the Motion
Discrimination mode in that it provides more precise and enhanced target discrimination. The
background audio threshold remains at the chosen level until an “accepted” target is presented
to the searchcoil. At that time a sharp audio response, a characteristic of all motion detectors,
occurs.
As with the Standard mode, the Elimination Control is used to change the detectors ability to
detect various types of metal; poor conductors can be eliminated while only slightly reducing
the detection of better conductors. Although the Discrete mode appears to achieve less
detection depth in air tests its ability to eliminate undesirable items precisely, without affecting
desirable items, enables it to outperform the Standard mode in certain situations. For example,
with the elimination control set to exclude pulltabs, they are excluded with little or no effect on
the detection response to most thin gold rings.
To pinpoint in the Discrete mode, sweep the searchcoil over the target. The searchcoil must
remain in motion to produce an audio response. This mode is designed to provide superior
pulse induction target discrimination and is especially useful in areas with a lot of trash

OPERATING INSTRUCTIONS

The following procedure shows just how easy it is to operate the Sea Hunter Mark ll detector.

1. Turn on the detector and note the results of the automatic battery check represented by

number of audio tones. Four tones indicate the batteries are good, two or three tones
indicate they are adequate. When one tone or no tone is sounded, replace the batteries.

2. Select either the Standard or Discrete Trash Elimination operating mode.

3. Adjust the threshold audio level to the desired setting. Typically this level is set to the

point that the threshold sound is just audible, barely above being silent.

4. Set the Elimination Control to zero or at least a very low level until you can determine

the types and amount of trash metal is present. Eliminate only the minimum amount of
items to insure that all acceptable targets are located to maximize your search goals.

Searching:
Scan the searchcoil at a speed of about one to two feet per second at a distance from the
ground of about one to two inches. An audio increase will indicate the presence of metal
beneath the coil.

Pinpointing and Target Recovery:
When the detector locates a target you must recover it to see what has been found. Pinpoint
the target by making an imaginary “X” over the target. Where the loudest sound is, the target
will be beneath the searchcoil. You may wish to switch into the Standard mode to enable you
to hover over the target, because in the Discrete mode searchcoil motion is required to
recognize the targets presence.
The final step is recovery and digging is usually involved. Always make as small a hole as
possible and always fill your holes when the target has been recovered. Use the proper tool for
the type of hunting you are doing. Recheck your hole for additional targets.

Batteries:
The Sea Hunter Mark ll requires eight (8) AA batteries. When replacements are required use
only high quality carbon, alkaline or rechargeable batteries. Each time the detector is turned on