New Transducers 250C ユーザーズマニュアル

G

ETTING

 S

TARTED

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I

NSTALLATION

To avoid drilling a hole to mount a thru-hull transducer, a transducer 

may be secured with epoxy inside a boat (“shoot-thru-hull” 

installation). This type of installation can reduce noise and allow you 

to use a higher gain setting. For a transducer to be mounted inside 

the hull (shoot-thru, not thru-hull), the boat must be fiberglass, 

with no core. If you are unsure of your boat type, contact the 

manufacturer. Professional installation may be necessary. Always 

wear a dust mask and safety goggles when installing.
Some transducers are specifically designed to be mounted inside a 

fiberglass hull. The standard plastic transom mount transducer can 

also be mounted in this fashion using the following method. If using 

a temperature sensing transducer, the temperature displayed reflects 

the hull temperature.
When choosing a location for the transducer, consider the following 

conditions:

•  The location has to be solid fiberglass, devoid of any air 

bubbles, laminates, fillers, or dead air space. 

•  The location needs to be in an area of clean water at all 

speeds. 

•  The location must not be over any strakes or behind any 

obstruction on the hull that would create turbulence at speed.

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

as shown below.

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 liquid, pointed directly at 

the bottom. Weight it down. Set the unit for optimum 

performance. If the sonar performance is significantly 

degraded, find and test another location.

Testing the Location

Strip Caulk  

or RTV Sealer

Hull 

PVC Pipe 

or a Can

Weight transducer 

to hold it in place

Fill pipe or can 

with water or a 

light mineral oil