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8. INTERPRETING THE DISPLAY
General
This section provides information necessary for interpreting the display.
Interpreting the Display
Seabed
When the tilt angle is changed, the seabed echo illustrated below will
appear on the screen. When the tilt angle is decreased, the seabed
trace becomes wider and weaker. By observing the seabed condition
on the screen, the skipper can prevent the net from being damaged by
a reef or a shipwreck.
Narrow tilt angle;
only half of vertical
beam width captures
the seabed.
Seabed
Echo
(a) Flat Seabed
Tilt Angle: 10° - 15°
Seabed is displayed
narrower and in a
stronger echo colors
compared to (a).
Seabed
Echo
(b) Flat Seabed
Tilt Angle: 20° or more
A shallow bottom is
displayed in a strong
echo color and with
a short tail.
Seabed
(c) Slanting Seabed
Tilt Angle: 20° or more
The deeper
seabed
echo in a
displayed in
a weak
color and
with a long
tail.