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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.
Fish echoes
(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.
Fish
school
Sea surface
reflections
Bottom
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.