Supplemental Text
8.2.3
Offset Mounting of the Sonar Head
In the case of a Sonar Head mounted so as to look at a river bank and under
wharf structures, this discussion assumes a thirty degree offset to starboard. If
the offset value of this mounting configuration is not identified properly, the ends
of the swath may be cut off by one, or both, of the depth gates intersecting the
bottom display even when a motion sensor is used.
In Figure 31, Line B represents the bottom as shown by a sonar head mounted
thirty degrees offset looking to starboard. In this illustration, the depth gates are
reacting properly to the motion sensor input, however, since the offset value of
head tilt has not been added the only area of this new swath that will be visible is
within the small box; everything else will be removed by the action of the depth
gates.
Sonar Head
MinDepth
MaxDepth
Lin
e B
Figure 31, Depth Gates, With No Offset
8.2.4
Using the Head Tilt Function
However, if the degree of offset (thirty degrees for this discussion) is entered at
the Head Tilt menu item, the layer formed by the depth gates will be rotated by
the same thirty degrees, as shown in Figure 32. For this discussion, the operator
must enter minus numbers for a starboard offset and positive numbers for port.
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SeaBat 8101 Operator's Manual
8-3
Version 3.02
