Furuno CH-500 Operator's Manual page 51

Bottom echoes
When the tilt angle is changed, the seabed echo appears on-screen in the manner
shown below. When the tilt is decreased, the bottom trace become weaker. By observ-
ing the seabed condition on the display, you can prevent damage to your nets.
(A) Flat seabed
Tilt angle: 10° to 15°
(B) Flat seabed
Tilt angle: 20° or more
(C) Sloping seabed
Tilt angle: 20° or more
Narrow tilt angle
Only half of
vertical beam
width captures
the bottom.
Bottom echo
displayed narrower
and in stronger
colors when
compared to (A).
Bottom echo
Shallow bottom
is displayed in a
strong color and
with a short tail.
2. HORIZONTAL MODE
The deeper The deeper The deeper
bottom echo is bottom echo is bottom echo is
displayed in a displayed in a displayed in a
weak color and weak color and weak color and
with a long tail. with a long tail. with a long tail.
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