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sonar signal must pass through solid fiberglass. Any air bubbles in the
fiberglass or the epoxy will reduce or eliminate the sonar signals.
Shoot-thru-hull transducer locations for
high speed or trolling speed operation.
Testing Determines Best Location
Ideally, the shoot-thru transducer should be installed as close to the
transom as possible, close to the centerline. This will give you the best
performance during high speed maneuvers.
1. Anchor the boat in about 30 feet of water. Add a little water to the sump
of the boat. Plug the transducer into the sonar unit, turn it on, then hold
the transducer over the side of the boat in the water. Adjust the sensitiv-
ity and range controls until a second bottom echo is seen on the display.
(You'll need to turn off Auto Sensitivity, Auto Depth Range and ASP™.
Try a range setting that is two to three times the water depth. The harder
(more rocky) the bottom, the easier it will be to get a second bottom sig-
nal.) Don't touch the controls once they've been set.
2. Next, take the transducer out of the water and place it in the water in
the sump of the boat, face down. (The transducer face is shown in the
figure on the following page.) Notice how the signal strength decreases.
The second bottom signal will probably disappear and the bottom signal
intensity will likely decrease.
Transducer location (trolling speed)
Transducer location (high speed)