How To Mount A Transducer Inside The Hull - Furuno GP-1670F Operator's Manual

13. INSTALLATION
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
mance is greatly degraded.
Necessary tools
The following tools are required:
• Sandpaper (#100)
• Marine sealant
• 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).
• 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.
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.
• 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.
2. Decide the most suitable site from the locations selected.
1) Connect the power cable and transducer cable to the display unit.
13-6
TM
and/or bottom discrimination display feature, since perfor-
1/2
Centerline
50 cm
15 cm
15 cm
50 cm
1/3
Transducer
mounting
location