2. HORIZONTAL MODE
2-47
Fish schools
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.
(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
When the tilt angle is shallow,
the reflection echo from bottom
is weak and the fish echo
which appears from bottom
is easy to find.
Fish schools
Summary of Contents for FSV-30
Page 1: ...COLOR SCANNING SONAR FSV 30 ...
Page 14: ...This page is intentionally left blank ...
Page 30: ...1 OPERATIONAL OVERVIEW 1 16 This page is intentionally left blank ...
Page 80: ...2 HORIZONTAL MODE 2 50 The page is intentionally left blank ...
Page 100: ...3 VERTICAL MODE 3 20 The page is intentionally left blank ...
Page 122: ...5 6 This page is intentionally left blank ...
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Page 152: ...8 OTHERS MENU 8 16 This page is intentionally left blank ...
Page 170: ...10 MAINTENANCE TROUBLESHOOTING 10 14 This page is intentionally left blank ...
Page 174: ...SP 4 This page is intentionally left blank ...
Page 182: ...ORIGINAL SETTING AP 8 New Original setting ...
Page 183: ...ORIGINAL SETTING AP 9 ...
Page 184: ...ORIGINAL SETTING AP 10 ...
Page 185: ...ORIGINAL SETTING AP 11 Color setting ...
Page 186: ...ORIGINAL SETTING AP 12 Color Response Curve setting ...