Humminbird 917C - Manual (Page 22)

• On boats with stepped hulls, it may be
possible to mount the transducer on the
step. Do not mount the transducer on
the transom behind a step to avoid
popping the transducer out of the water
at higher speeds; the transducer must
remain in the water for the control head
to maintain the sonar signal.
• If the transom is behind the propeller(s), it may be impossible to find
an area clear from turbulence, and a different mounting technique or
transducer type should be considered, such as an Inside the Hull
Transducer (see Inside the Hull Transducer Installation).
• If you plan to trailer your boat, do not mount the transducer too close
to trailer bunks or rollers to avoid moving or damaging the transducer
during loading and unloading of the boat.
• If high speed operation is critical, you may want to consider using an
In-Hull transducer instead of this Transom Mount transducer.
NOTE: The hydrodynamic shape of your transducer allows it to point straight
down without deadrise adjustment.
NOTE: If you cannot find a transom mount location that will work for your high-
speed application, find an In-Hull Transducer by contacting our Customer
Resource Center at either 1-800-633-1468 or by visiting our website at
www.humminbird.com.
2. Preparing the Mounting Location
In this procedure, you will determine the mounting location and drill two
mounting holes, using the transducer mounting bracket as a guide.
1. Make sure that the boat is level on the trailer, both from port to
starboard and from bow to stern, by placing your level on the deck
of the boat, first in one direction, then in the other.
2. Hold the mounting bracket against the transom of the boat in the
location you have selected (Figure 18). Align the bracket horizontally,
using the level; make sure that the lower corner of the bracket does
not protrude past the bottom of the hull, and there is at least 1/4"
clearance between the bottom of the bracket and the bottom of the
transom for fiberglass boats, and 1/8" clearance for aluminum boats.
Positioning the
Mounting Bracket
Level
Le
ve
l
Boat Hull Types Require
Different Mounting Positions
1/4” for fiberglass
1/8” for aluminum
Deadrise Angle
14