Simrad ES120-7C - REV D, Installation Manual, Page: 76 / 98

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On small vessels we recommend mounting the transducer on that side of the keel where
the propeller blades move
upwards . This is because the propeller cavitation is weakest on
that side. The cavitation starts when the water flows in the same direction as the propeller
blades. This is where the propeller blades move downwards.
Mount the transducer at a safe distance from
bow thruster(s)
Bow thruster propellers are extremely noisy. When you decide where to place the transducer,
you must consider the noise created by most bow thrusters.
When in operation, the noise and cavitation bubbles created by the thruster may make your
ES120-7C Transducer useless, almost no matter where the transducer is installed. When the
bow thrusters are
not in operation, the tunnel creates turbulence. If your vessel is pitching,
the tunnel may be filled with air or aerated water in the upper position and release this in
the lower position.
In general, the transducer should therefore be placed well away from the bow thruster(s).
However, this is not an invariable rule. Certain thruster designs - combined with their
physical locations on the hull - may still offer a suitable location for the transducer, even
close to the thruster. If you are in doubt, consult a naval architect.
Simrad ES120-7C Installation Manual