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6. INTERPRETING THE DISPLAY
6-2
6.2 Fish School
A fish school appears as a mass of echoes. The color of the mass shows the
density. To know the distribution and center point of a fish school, choose
several different tilt angles.
(A) Sea surface fish
Tilt angle: 0˚ to 10˚
(B) Midwater, bottom fish
Tilt angle: 30˚ or more
Fish echo which appears before bottom can be detected.
Tilt angle: 0˚ to 20˚
Fish echo which appears together with
or after bottom can be detected.
Bottom
Fish
school
Sea surface
reflections
Fish
school
Bottom echo not
displayed because
of decreased tilt angle.
Sea surface
reflections are
present.
Fish
school
Large midwater
fish school is
present.
Bottom
To search bottom fish, use a
narrow tillt angle so the bottom
echo will be weak, enabling you
to see bottom fish echoes.
Fish echoes