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6. INTERPRETING THE DISPLAY
6-2
6.2
School of Fish
A school of fish appears as a mass of echoes. The color of the mass shows the den-
sity. To know the distribution and center point of a school of fish, choose several dif-
ferent 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.
School
of fish
Sea surface
reflections
Bottom
School of fish
Bottom echo
not
displayed
because of
decreased tilt
angle. Sea
surface
reflections are
present.
School of fish
Large midwater
school of fish 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.
Содержание CHS-5LMARK-2-55
Страница 8: ...TABLE OF CONTENTS vi APPENDIX 1 MENU TREE AP 1 SPECIFICATIONS SP 1 INDEX IN 1 ...
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Страница 30: ...1 OPERATIONAL OVERVIEW 1 18 This page is intentionally left blank ...
Страница 38: ...2 FINE TUNING THE SONAR PICTURE 2 8 This page is intentionally left blank ...
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