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6-1
INTERPRETING THE DISPLAY
Seabed Echoes
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.
(A) Flat seabed
Tilt angle: 10° to 15°
(B) Flat seabed
Tilt angle: 20° or more
(C) Sloping seabed
Tilt angle: 20° or more
Seabed
Shallow bottom
is displayed in
a strong color
and with a
short tail.
Seabed is displayed
narrower and in
stronger colors when
compared to (A).
Narrow tilt angle
Only half of
vertical beam width
captures the seabed.
Figure 6-1 Seabed echoes