How To Interpret The Horizontal Display; Bottom And School Of Fish Echoes - Furuno FSV-25 Operator's Manual

2. HORIZONTAL MODE
2.23

How to Interpret the Horizontal Display

2.23.1

Bottom and school of fish echoes

Bottom echoes
When the tilt angle is changed, the bottom echo illustrated below will appear on the
display. When the tilt is decreased (toward 0°), 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
2-40
Bottom echo
The bottom
echo is cap-
tured by the
entire beam.
The bottom
echo in the
foreground is
strong; weak
on the
periphery.
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.