Kongsberg Simrad SX90 Reference Manual page 231

Fish-finding sonar

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installed. This sensor may be mounted anywhere on the vessel. Because of this, the risk of

stabilization offset misalignment is present.

The two screen captures below illustrate how the SX90 system can provide inaccurate data

if the stabilization offset is misaligned. In both examples, the tilt is set to approximately 24

degrees, and you are looking at the echoes from a flat bottom at a very short range. The

first example is made without any offset errors, and the echoes from the bottom are evenly

distributed in the circle. On the second screen capture, a 3 degrees roll offset error causes

the echoes to be "distorted". This error will of course be more visible on longer ranges.