Furuno CH-37 - Manual (Page 35)

2-19
Bottom echoes
When the tilt angle is widened, the bottom echo illustrated be-
low will appear on the display. When the tilt is narrowed, the
bottom trace becomes wider and weaker. By observing the
bottom condition on the display, the skipper can prevent net
damage.
(A) Flat bottom
Tilt angle: 10
°
to 15
°
(B) Flat bottom
Tilt angle: 20
°
or more
(C) Sloping bottom
Tilt angle: 20
°
or more
Bottom
Shallow bottom
is displayed in
a strong color
and with a
short tail.
Bottom is displayed
narrower and in
stronger colors when
compared to (A).
Narrow tilt angle
Only half of
vertical beam width
captures the bottom.
The deeper bottom
echo is displayed in
a weak color and
with a long tail.
Figure 2-17 Bottom echoes