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Seabed Echoes
(A) Flat seabed
Tilt angle: 10 to 15
(B) Flat seabed
Tilt angle: 20 or more
(C) Sloping seabed
Tilt angle: 20 or more
INTERPRETING THE DISPLAY
When the tilt angle is widened, the seabed echo illustrated be-
low will appear on the display. When the tilt is narrowed, the
seabed trace becomes wider and weaker. By observing the sea-
bed condition on the display, the skipper can prevent net dam-
age.
Figure 6-1 Seabed echoes
Narrow tilt angle
Only half of
vertical beam width
captures the seabed.
Seabed is displayed
narrower and in
stronger colors when
compared to (A).
Shallow bottom
is displayed in
a strong color
and with a
short tail.
Seabed
6-1
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