Kongsberg Simrad SN90 Reference Manual page 582

Simrad SN90 Reference Manual
The required accuracy of the offset and rotation angles depends on the accuracy
requirements for the echo data.
Note
Correct values for motion sensor rotation are critical for the sonar performance.
The motion sensor offset values (its physical location relative to the vessels' coordinate
system) are not important for sonar operation.
The Kongsberg Seapath
location in the positioning system. If this is done, the MRU offset values in the SN90
system must be set to 0 (zero) to avoid "dual compensation". The rotation angles are
normally not recorded by the positioning system. These can either be inserted into the
MRU control application, or into the SN90 system. Make sure that you do not insert
them both places.
Rotation around the
A
x-axis: In the positive
horizontal direction
(forward), a positive
rotation is clockwise.
Rotation around the
B
y-axis: In the positive
horizontal direction
(starboard), a positive
rotation is clockwise.
Rotation around the
C
z-axis: In the positive vertical direction (down), a positive rotation is clockwise.
Reference point (Ship Origin)
D
Details
X Offset
Select the offset value on
the X axis (fore-and-aft
direction) from the Ship
Origin. Adjust with a
positive value for X if the
sensor is located ahead
of the ship origin.
Y Offset
Select the offset value on the Y axis (athwartship) from the Ship Origin. Adjust
with a positive value for Y if the sensor is located on the starboard side of the
ship origin.
580
® - and other GPS systems - allow you to define the MRU
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