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Inside the Hull Transducer Installation
(1157c Combo models only)
If you choose to mount your transducer inside the hull of your boat, perform the procedures in this section.
In-hull mounting 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 occurs. The amount of loss depends on hull construction and thickness, as well as the
installation position and process.
This installation requires slow-cure two-part epoxy. Do not use silicone or any other soft adhesive to install
the transducer, as this material reduces 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.
NOTE: In-hull mounting requires an installed and operational control head.
NOTE: The integral temperature probe will not work with in-hull mounting, so you may either want to consider
purchasing a Temperature/Speed accessory, a Temp. Sensor, or obtaining a different transducer. Humminbird®
offers a transducer exchange program to swap the NEW and UNASSEMBLED transducer, accompanied by
mounting hardware, for one without an integral temperature probe. Call the Humminbird® Customer Resource
Center at 1-800-633-1468 for details, or visit www.humminbird.com for more information.
NOTE: Your transducer may not look exactly like the transducer shown in the illustrations, but it will mount
in exactly the same way.
• Locate transducer mounting location
• Perform a trial installation
• Route the transducer cable
• Permanently mount the transducer.
1. Determine the transducer mounting location
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.
NOTE: Do NOT install the 1197c Side Imaging transducer inside the hull, as the side
looking beams CANNOT penetrate the hull. Only the 1157c Dual Beam PLUS™ transducer
can be mounted inside the hull.
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