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Shoot-thru-hull transducer locations for
high speed or trolling speed operation.
To choose the proper location for shoot-thru-hull mounting, follow these
testing procedures: (You may need a helper to complete these steps.)
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
sensitivity 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 signal.) Don't touch the controls once they've been set.
Example of a second bottom signal. Unit is in 30 feet of water, with
range set at 80 feet and sensitivity set at 87 percent.
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 sig-
nal intensity will likely decrease.
Transducer location
(trolling speed)
Transducer location
(high speed)
Second bottom
True bottom
Manual range setting