Garmin GPSMAP 178C Owners Manual - Page 109

Selecting a location, Testing the location, Installing the transducer

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To avoid drilling a hole to mount a thru-hull transducer, a transom mount transducer may be used with epoxy inside a boat ("shoot-thru-hull" installation). For a transducer to be mounted inside the hull (shoot-thru, not thru-hull), the boat must be fiberglass, no core (contact your boat manufacturer if you are unsure). Test by placing a small amount of water inside the hull, placing the transducer on top of the water, then verifying the accuracy of the locators versus the current water depth. If they are the same, use slow-curing epoxy (non-silicone based) to affix the transducer to the inside of the hull. Shoot-Thru-Hull Installation The transducer is designed to be mounted inside a fiberglass hull. The standard plastic transom mount transducer can also be mounted in this fashion using this method. If using a temperature sensing transducer, the temperature displayed reflects the hull temperature. Selecting a location: 1. 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. Do not place the transducer over any strakes or behind any obstruction on the hull that would create turbulence at speed. F NOTE: Many modern hulls have a prelocated 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. Testing the location: 1. Place the transducer in the water, pointed directly at the bottom and set unit for optimum perfor- mance. Place the transducer in the test device as show on the side bar. If the sonar performance is significantly degraded, another location needs to be tested. Installing the transducer: 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" tall. Pour about 1/8" of two part, slow cure epoxy in the dam. Place the transducer in the epoxy, turning the transducer to work out any air bubbles. 3. Weight the transducer in place and allow to cure for 24 hours. Appendix A Mounting the Transducer PVC Pipe or a Can Weight transducer to hold it in place Strip Caulk or RTV Sealer Fill Pipe or Can with water or a light mineral oil Hull Surface Testing the Location 99

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ºº
Appendix A
Mounting the Transducer
To avoid drilling a hole to mount a thru-hull transducer, a transom mount transducer may be used
with epoxy inside a boat (“shoot-thru-hull” installation). For a transducer to be mounted inside the hull
(shoot-thru, not thru-hull), the boat must be fiberglass, no core (contact your boat manufacturer if you
are unsure). Test by placing a small amount of water inside the hull, placing the transducer on top of the
water, then verifying the accuracy of the locators versus the current water depth. If they are the same, use
slow-curing epoxy (non-silicone based) to affix the transducer to the inside of the hull.
Shoot-Thru-Hull Installation
The transducer is designed to be mounted inside a fiberglass hull. The standard plastic transom
mount transducer can also be mounted in this fashion using this method. If using a temperature sensing
transducer, the temperature displayed reflects the hull temperature.
Selecting a location:
1. 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. Do not place the transducer over any
strakes or behind any obstruction on the hull that would create turbulence at speed.
NOTE:
Many modern hulls have a prelocated pocket for shoot-thru-hull transducer
±nstallat±on. If you are unsure ±f your hull ±s equ±pped w±th a pre-located pocket,
contact your hull manufacturer.
Testing the location:
1.
Place the transducer in the water, pointed directly at the bottom and set unit for optimum perfor-
mance. Place the transducer in the test device as show on the side bar. If the sonar performance is
significantly degraded, another location needs to be tested.
Installing the transducer:
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” tall. Pour about 1/8” of two part, slow cure epoxy in the
dam. Place the transducer in the epoxy, turning the transducer to work out any air bubbles.
3. Weight the transducer in place and allow to cure for 24 hours.
F
Testing the Location
Strip Caulk
or RTV Sealer
Hull Surface
PVC Pipe
or a Can
Weight transducer
to hold it in place
Fill Pipe or Can
with water or a
light mineral oil