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Antifouling Paint
Marine growth can accumulate rapidly on the transducer's surface. If the vessel is left in saltwater for extended periods of time, all components of the
transducer below the waterline must be painted with WATER BASED antifouling paint.
• Never use ketone-based paint, as this type of paint can damage to the transducer's plastic shell.
• Clear, spray on antifouling paints are very easy to apply and can be purchased from your local boating supply store.
• Reapply paint as needed to prevent marine growth.
Testing
1. Become familiar with the depth sounders function and performance at idle speeds.
2. Gradually increase the boat speed and observe performance of the depth sounder.
4. If the performance improves when turning, the sensors position probably needs adjustment
because it is in aerated water.
5. Move the transducer farther down on the transom.
6 .If the performance does not improve, move the transducer closer to the centerline making sure
to fill any unused screw holes with marine sealant.
I
-H
M
T
T
N
ULL
OUNTING
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Applications
• High Speed Boats to increase the performance of the depth sounder.
• Trailer boats to prevent accidental damage to the transducer from trailering.
• Shallow draft boats to prevent accidental damage to the transducer to from intentional or unintentional ground.
• NON-CORED hulls or Aluminum Hulls thinner than 1/8"
Hull Material
Since the hull absorbs acoustic energy, transmitting through the hull
reduces the transducers performance. Fiberglass hulls are often reinforced
in places for added strength. These cored areas contain balsa wood or
structural foam which are poor sound conductors. To achieve optimal per-
formance, find a location where the hull laminate is solid (not cored).
Location
Consult the boat manufacturer for the best in-hull transducer placement. If
this information is unavailable, follow the guidelines below and see Figure
7.
• Outboard powerboats - Install as close to the stern as possible
• Inboard / outboard powerboats - Install close to the engine(s)
• Inboard powerboats - Install forward of the propeller(s) and shaft(s)
• Sailboats - Install near the centerline of the hull and forward of the
leading edge of the keel
Testing at the Selected Location
• Place the boat into a body of water where the depth is generally known
(you may also consider using a stick to hang the transducer over the
side of the vessel to develop known depth readings).
• While the boat is anchored, use one of the methods below in Figure 8
to test the depth sounder with the transducer at the desired in-hull
location.
• If the test readings noticeably differ from the known depth you will need
to find another location.
• If the readings are similar mark the spot in the hull and proceed to
Selecting the Adhesive.
FIGURE 8A
If the hull surface is not smooth, sand it with 30 grit sandpaper until a
•
smooth surface is obtained. Partially fill a thin plastic bag with water, place the transducer inside and close it tightly with a tie wrap. Wet the surface
of the hull and press the transducer face against it through the bag.
FIGURE 8B
• If the transducer will be located in an area in the hull that holds water, place the transducer
against the hull and allow bilge water to cover the surface where the transducer touches the hull.
FIGURE 8C
• If the hull surface is not smooth, sand it with 30 grit sandpaper until a smooth surface is obtained.
Coat the face of the transducer with petroleum jelly and press it against the hull with a twisting
motion. Use duct tape to hold it in place.
RANSDUCER
Please read the instructions completely before proceeding with the installation.
IMPORTANT!!!!
Outboard
&
Inboard/Outboard
A
- 3 -
IMPORTANT!!!!
High Speed performance of the depth sounder
may require extensive adjustment and testing to
find the best transducer mounting location. This
transducer has been tested to perform up to 63
MPH in a transom mount application. Not all boat
hull configuration will allow for this type of perform-
ance. If you are not satisfied with the performance
of the depth sounder, it is recommended that you
seek the advice of a professional marine electron-
ics installer.
Inboard
B
IMPORTANT!!!!
If you do not get satisfactory depth readings, try
different locations inside the hull. If you cannot
obtain a satisfactory reading using these methods,
you will not be able to mount the tranducer in-hull
on your vessel. Please contact NMP at 888-667-
2767 for transducer exchange information.
Figure 7
Sailboat
Figure 8
C
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