Simrad SH90 - REV A, Operator'S Manual

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Simrad SH90
Figure 16 Cavitation
[1]
When the bubbles collapse, they cause very strong local
shock-waves in the water. These may be audible and can also
damage the propeller blades. In addition to this, the cavitation
will generate very strong reverberation, commonly seen as a red
stripe of echoes behind the vessel.
If you have big problems with cavitation, try to adjust the
propeller pitch and/or the number of revolutions.
Reverberation
Reverberation is generated when the echoes from your sonar
transmission are reflected not only by fish and objects in the
water, but also from the bottom and the sea surface.
Figure 17 Reverberation
(CD015005E)
B
A
1. Photo from US Navy/Wikipedia in the public domain.
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