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2. SONAR MODE
2-11
2.9.3
Schools of fish echo
A school of fish appears as a mass of echoes on the screen. The color of the mass
shows the density of schools of fish on the sonar beam. To find distribution and center
point of a school of fish, try several different tilt angles.
1) Sea surface fish (Tilt angle 0° to 10°)
2) Midwater, bottom fish (Tilt angle 0° to 20°)
3) Midwater, bottom fish (Tilt angle 30° or more)
2.9.4
Sea surface reflections
To reduce sea surface reflections, set the tilt angle to 5 or higher, so the upper edge
of the sonar beam does not hit the sea surface, or adjust TVG. When a narrow tilt an-
gle is used, sea surface reflections cover a large area as illustrated below.
School of fish
Large midwater,
a school of fish
is present.
Sea surface
reflections
Bottom
School of fish
School of fish
School of fish
School of fish
Large midwater,
a school of fish
is present.
Bottom
11°
11°
Tilt angle: 0°
Tilt angle: 5°-7°
Tilt angle
indication
Sea surface
refrections
R 200
T 0˚
Содержание CH-37BB
Страница 1: ...COLOR SECTOR SCANNING SONAR CH 37BB OPERATOR S MANUAL www furuno com Model ...
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