Humminbird 997c SI Combo, Installation And Operation Manual

Page: 22 / 151

Transom Transducer Installation
If you will be installing a transom mounted transducer, use the procedures
in this section. There are two pieces to the transducer mount assembly: the
pivot, and the bracket. Your transducer comes with a two-piece metal and
plastic bracket assembly. There are several procedures you will have to
perform in order to install a transom-mounted transducer. They are:
• Determine transducer mounting location
• Mount the bracket to the boat
• Attach the pivot to the transducer
• Mount the transducer pivot assembly to the bracket
• Adjust the running position of the transducer
• Route the transducer cable
• Perform a final test of the transom transducer installation.
To determine transducer mounting location:
NOTE: If transom mounting is not possible because of a stepped hull or
cavitation noise, trolling motor installation may be an option. See Trolling Motor
Transducer Installation for more information.
1. First, determine the best location on the transom to install the
transducer. Consider the following to find the best location:
• It is very important to locate the transducer in an area which is relatively
free of turbulent water. As a boat moves through the water, turbulence
is generated by the weight of the boat, and the thrust of the propeller(s)
- either clockwise or counter-clockwise. This turbulent water is normally
confined to areas immediately aft of ribs, strakes or rows of rivets on the
bottom of the boat, and in the immediate area of the propeller(s).
Clockwise propellers create more turbulence on the port side. On
outboard or inboard/outboard boats, it is best to locate the transducer
at least 15" (380 mm) to the side of the propeller(s).
• The best way to locate turbulence-free water is to view the transom
while the boat is moving. This method is recommended if maximum
high-speed operation is a high priority. If this is not possible, select a
location on the transom where the hull forward of this location is
smooth, flat and free of protrusions or ribs.
Deadrise Angle
Areas of Possible Turbulence
Rivets Strakes
Transom Hull
Stepped Hull
Step Rib
14