Fish Schools - Furuno CSH-23/24 Operator's Manual

Fish Schools

(A) Sea surface fish
Tilt angle: -5 to 10
(B) Midwater, bottom fish
Fish echo which appears before seabed can be detected.
Tilt angle: -0 to 20
Fish echo which appears together with
or after seabed can be detected.
11-2
A fish school appears as a mass of echoes on the screen. The
color of the mass shows the density of fish schools on the sonar
beam. To find distribution and center point of a fish school, try
several different tilt angles.
Sea surface
reflections
Tilt angle: 30 or more
Figure 11-2 Fish schools
Fish
school
Seabed
Fish
school
Seabed echo not
displayed because
of narrow tilt angle.
Sea surface
reflections are
present.
Fish
school
Large midwater
fish school is
present.
Seabed