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13. INSTALLATION
13-6
13.3.3 How to mount a transducer inside the hull
The transducer may also be installed inside the hull on FRP boats. However, this in-
stallation method affects the ability to detect the bottom, fish and other objects be-
cause the ultrasound pulse is weakened when it passes through the hull.
Note: This mounting method should not be used to mount the transducer that sup-
ports the ACCU-FISH
TM
and/or bottom discrimination display feature, since perfor-
mance is greatly degraded.
Necessary tools
The following tools are required:
Remarks on installation
Installation procedure
The attenuation of the ultrasound pulse varies with the thickness of the hull. Select a
location where attenuation is the lowest.
1. Select 2-3 locations considering the four points mentioned below. (You will finalize
the mounting location through some trial and error later.)
2. Clean the face of the transducer to remove any foreign material. Lightly roughen
the face with #100 sandpaper. Also, use the sandpaper to roughen the inside of
the hull where the transducer is to be mounted.
• Sandpaper (#100)
• Silicone sealant
• Do the installation with the ship moored at a dock, etc. The water depth should be 6.5-
32 feet (2-10 meters).
• 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.
• Before attaching the transducer to the hull, check that the site is suitable. Put the
transducer in a water-filled plastic bag. Connect the transducer to the display unit and
put the transducer on the installation site. Turn on the display unit and check that the
depth indication appears.
• Mount the transducer at a location 1/2 to 1/3 of the length of your 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 rolling.
1/3
1/2
Centerline
Transducer
mounting
location
50 cm
50 cm
15 cm
15 cm