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6-1
6. INTERPRETING THE DISPLAY
6.1 Bottom Echo
When the tilt angle is changed, the bottom echo will appear on the screen. When the
tilt angle is decreased, the bottom trace becomes wider and weaker. By observing the
bottom condition on the screen, the skipper can prevent the net from being damaged
by a reef or a shipwreck.
Bottom echoes
(A) Flat bottom
Tilt angle: 10° to 15°
(B) Flat bottom
Tilt angle: 20° or more
(C) Solping bottom
Tilt angle: 20° or more
Decreased tilt angle
Only half of vertical
beam width captures
the bottom.
Bottom is displayed
narrower and in
stronger colors when
compared to (A).
Shallow bottom is
displayed in a
strong color and
with a short tail.
Bottom
The deeper, sloping
bottom echo is displayed
in a weak color and with
a long tail.