Garmin gpsmap 400 Manuale Utente

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When installing a transducer, the installation location must be the 

following:

•  Solid fiberglass, without any air bubbles, laminates, fillers, or

dead air space. 

•  In an area of clean (non-turbulent) water at all speeds. 
•  The location must not be over any strakes or behind any 

obstruction on the hull that would create turbulence.

  NOTE: Many modern hulls have a dedicated pocket for 

shoot-thru-hull transducer installation. If you are unsure if your 

hull is equipped with a pre-located pocket, contact your hull 

manufacturer.

1.  Fabricate a test device from a section of PVC pipe or a can,

as shown in the following illustration.

2.  Temporarily seal the test device to the hull with caulking or

RTV sealer, and fill with water or light mineral oil.

3.  Place the transducer in the water, pointed directly at

the bottom and weight it down. Set the unit for optimum

performance. If the sonar performance is significantly 

degraded, another location must be tested.

1.  Lightly sand the surface of the hull and face of the transducer

with 400 grit wet or dry sandpaper.

2.  Build a dam using strip caulk about 1/4" (6 mm) tall. Pour

about 1/8" (3 mm) of two-part, slow-cure epoxy into the dam. 

3.  Place the transducer in the epoxy, turning the transducer to

work out any air bubbles.

4.  Weight the transducer in place, and allow it to cure for

24 hours.