2. HORIZONTAL MODE
2-14
Fish schools
Fish schools appear as a mass of echoes on the screen. The color of the mass indi-
cates the school density. To find the distribution and center of a school, try using dif-
ferent tilt angles.
When the tilt angle is shallow, the reflection echo from the seabed is weaker. This
makes the fish echoes from the seabed easier to find.
(A) Sea surface fish
Tilt angle: 0° to 10°
(B) Midwater/bottom fish
Tilt angle: 30° or more
(B) Midwater/bottom fish
Tilt angle: 0° to 20°
Fish echoes which appear together with,
or after, the seabed can be detected.
School of fish
Large midwater,
a school of fish
is present.
Bottom
Bottom
School of fish
School of fish
School of fish
School of fish
Large midwater,
a school of fish
is present.
Sea surface
reflections
Summary of Contents for CH-500
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