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Transducer Installation Overview
The 1157c Combo units and the 1197c SI Combo units use two different types of transducers. Find the
installation section that describes your transducer type.
1197c SI Transducer Installation
(1197c SI Combo models only)
If you have a 1197c SI Combo unit, there are two different installation methods for your transducer:
• Transom Transducer
• Trolling Motor Transducer.
Find the section that describes the method of installation you will be using.
NOTE: If the included transducer will not work for your application, you may exchange it, NEW and UNASSEMBLED,
with mounting hardware included, for a transducer appropriate for your application - often at very little or no charge
depending on the transducer. Call the Humminbird® Customer Resource Center at 1-800-633-1468 for details and
pricing, or visit www.humminbird.com.
NOTE: In addition to the hardware supplied with your transducer, you will need a powered hand drill and various
drill bits, various hand tools, including a ruler or straightedge, a marker or pencil, safety glasses and dust mask, and
marine-grade silicone sealant.
NOTE: When drilling holes in fiberglass hulls, it is best to start with a smaller bit and use progressively larger drill
bits to reduce the chance of chipping or flaking the outer coating.
NOTE: Due to the wide variety of hulls, only general instructions are presented in this installation guide. Each boat
hull represents a unique set of requirements that should be evaluated prior to installation. It is important to read
the instructions completely and understand the mounting guidelines before beginning installation.
Transducer Mount Position
Unobstructed View: The jack plate gives the transducer
safe distance from the motor and turbulence. The side
imaging has a clear view side-to-side.
Obstructed View: The transducer is too close to motor
turbulence, and the side imaging view is blocked by
the motor. The view cannot extend from side-to-side.
The Side Imaging transducer has some special requirements because of its side viewing capabilities:
• The Side Imaging transducer must NOT have anything obstructing the ‘view’ of the side
looking beams, i.e. nothing can be in the line of sight of these beams (not a hull, motor, or
other transducer, etc).
NOTE: You may need to tilt the motor up and out of the way when using the side looking beams.
• In order for the side beams to be displayed accurately, the transducer must be mounted so that
it is looking straight down in the water when the boat is in the water.
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