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9-1
INTERPRETING THE DISPLAY
Seabed Echoes
When the tilt angle is set at 90 degrees with the sector center
faced dead ahead, the pictures illustrated below will appear on
the screen. The seabed echo is represented on the screen as a
thick line which realistically shows the bottom contour. When
the tilt angle is decreased, the seabed trace becomes wider and
weaker. By observing the seabed condition on the screen, you
may prevent the net from being damaged by a reef or a shipweck.
Tilt: 90˚
Tilt: 60˚
Sea surface
reflections
Seabed
Sea surface
reflections
Seabed
Sea surface
reflections
This distance
shows the depth
of the water
Seabed
Ridge
Figure 9-1 Seabed echoes