Humminbird PiranhaMAX 155 Installation And Operation Manual page 16

• 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 trans-
ducer must remain in the water for the control head to maintain the sonar
signal (Figure 9).
• 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.
• 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.
Figure 10
Find a turbulence-free location at least 15" from the propeller(s)
and not in line with trailer bunks or rollers. (Figure 10).
NOTE: The hydrodynamic shape of your transducer allows it to point straight down
without deadrise adjustment (Figure 11).
NOTE: If you cannot find a transom mount location that will work for your
high-speed application, visit the FAQ (Frequently Asked Questions) section of our
Web site at humminbird.com or call Customer Service at 1-800-633-1468.
Transom Transducer Installation
15"
level
8
deadrise angle
Figure 11