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Some part of the main beam and the secondary component go above the fish. When operating in water depths of 50+
ft, with the fish near the bottom, the upper sound wave does not effect the display. However, with the fish within 20 ft
of the surface, the water surface and targets on the surface will effect the display. If the water surface is fairly calm, there
will be little effect on the display. If the water is very rough (choppy), and the fish is close to the surface, the echo
reflections from the waves will be visible on the display. The drawings below show the effect of surface targets when
the fish is close to the surface.
Fish
Tail
Target #1
All of the targets shown above will be picked up and displayed as shown below. Drawing assumes targets are
in a straight line (water column factor not included - covered later). The displayed position of target #4 is not an
error; #4 is much closer to the transducer than #2.
Target #1
Target #4
Target #4
Water Surface
Target #2
Right Channel Display
Print Head - Right Channel
Target #2
18
Target #5
Target #3
Target #3
Target #5
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