User Guide

20
INSIDE THE HULL MOUNTING,
PUCK TRANSDUCERS ONLY
Perform these particular inside the hull instructions
only if you have a puck transducer. Inside the hull
mounting of the transducer generally produces good
results in single thickness fiberglass hulled boats.
Humminbird® cannot guarantee depth performance
when transmitting and receiving through the hull of
the boat, since some signal loss will occur. The amount
of loss depends on hull construction and thickness,
and the installation.
This type of installation requires the use of a slow-cure two-part epoxy (included with your
transducer). Do not use silicone or any other soft adhesive material to install the transducer, as
this material will reduce the sensitivity of the unit. Do not use five-minute epoxy, as it has a
tendency to cure before all the air bubbles can be purged, thus reducing signal strength.
1. Locating the Transducer Mounting Position
Decide where to install the transducer on the inside of the hull. Consider the following to find the
best location:
• Observe the outside of the boat hull to find the areas that are mostly free from turbulent
water. Avoid ribs, strakes and other protrusions, as these create turbulence.
• As a general rule, the faster the boat can travel, the further aft and closer to the centerline
of the hull the transducer has to be located in order to remain in contact with the water
at high speeds.
2. Trial Installation
You will not be able to adjust the mounting after an inside the hull
transducer is installed. It is best, therefore, to perform a trial
installation first that includes running the boat at various speeds, in
order to determine the best mounting area before permanently
mounting the transducer.
1. Plug the transducer into the depthsounder, then power up the
depthsounder. When the depthsounder detects a functioning
transducer, it will automatically enter Normal operating mode.
2. View the sonar signal at its best by holding the transducer over
the side, immersed in the water, so that it is pointing straight
down over a known flat bottom. Use the display to benchmark
against the sonar signal that will be detected once the
transducer is placed in the hull.
Preferred Mounting Area
Inside the Hull Installation
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NOTE: It is often necessary to make several incremental transducer adjustments before
optimum high speed performance is achieved.
4. Once you have obtained successful test results, you must install the third mounting screw
for transom mount transducer installations.
IMPORTANT: For Transom Mount transducer installations, install the third mounting screw
after the final transducer adjustments. Hand tighten only.
5a. If you have a Single Piece mounting bracket, use the bracket as a guide and drill the third
hole to a depth of approximately 1" using a 9/64" (3.5 mm) drill bit, apply marine-grade
silicone sealant to the hole, and lock down the transducer settings by screwing in the third
#8 x 5/8" (16 mm) wood screw. Hand-tighten only.
5b. If you have a Two Piece Kick-up mounting bracket, mark the transducer bracket location
on the transom with a pencil, then pop up the bracket to reveal the mounting screws. Find
the third mounting hole in the vertical center of the bracket. Make sure that the bracket
location is in between the same place and drill the third hole to a depth of approximately
1" using a 9/64" (3.5 mm) drill bit. Fill the mounting hole with marine-grade silicone, then
install the third #8 x 5/8" (16 mm) wood screw before snapping the transducer bracket
closed. Hand-tighten only.
6. Your depthsounder is now ready for operation.
Installing the Third Mounting Screw
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