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 Deadrise Angle 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

Boat Hull Types Require

Mounting Bracket

Different Mounting Positions

Level

 

 

Level

 

1/4” for fiberglass

 

1/8” for aluminum

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Image 22
Humminbird 957C Preparing the Mounting Location, Popping the transducer out of the water, To maintain the sonar signal