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1.3.3
How to mount a Thru-hull transducer inside the hull
The thru-hull mount transducer may also be installed inside the hull on FRP boats.
However, this installation method affects the ability to detect the bottom, fish and other
objects because the ultrasound pulse is weakened when it passes through the hull.
Do not install the transducer inside the hull on a steel or wooden hull vessel, since the
ultrasound pulse cannot penetrate those hulls.
Necessary tools
You will need the following tools:
• Sandpaper (#100)
• Water-filled plastic bag
Remarks on installation
• Do the installation with the ship moored at a dock, etc. The water depth should be 6.5-
32 feet (2-10 meters).
• Install the transducer within the engine room.
• Turn off the engine.
• Do not power the unit with the transducer in the air, to prevent damage to the trans-
ducer.
• Do not use this method on a double layer hull.
Installation location
If the thickness of the hull varies, then the attenuation of the ultrasound pulse may
vary. Select a location where the attenuation is the lowest.
1. Select two or three locations considering the four points mentioned below. (You
will finalize the mounting location through some trial and error later.)
• Mount the transducer at a location 1/2 to 1/3 of the length of the boat from the
stern.
• The mounting location is between
15 to 50 cm from the centerline of
the hull.
• Do not place the transducer over
hull struts or ribs which run under
the hull.
• Avoid a location where the rising
angle of the hull exceeds 15°, to
minimize the effect of the boat's roll-
ing.
NOTICE
This mounting method should not be
used to mount the transducer that
supports the ACCU-FISH
discrimination display or the
[Enhanced] RezBoost™ functions since
performance is greatly degraded.
• Adhesive (Marine sealant)
12
TM
, the bottom
Centerline
50 cm
15 cm
15 cm
50 cm
1. MOUNTING
1/2
1/3
Transducer
mounting
location
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