Koden ESR-145, Operation Manual

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SONAR SYSTEM SUMMARY
TILT ANGLE
The tilt angle shows the direction to which the sound
wave is emitted. The tilt angle can be set in step of 1°
from 0° to +5° (upward) to 0° to 90° (downward).
Find out the suitable tilt angle for a given depth and
detection range.
The tilt angle is of importance when working with sonar.
Refer to the illustration below.
Find out the suitable tilt angle and beam coverage.
When the ship approaches B with the same tilt angle, the reflection is getting smaller
and weaker gradually and nothing appears at B position.
Without changing the tilt angle, the fish school is out of beam coverage at B position
so that no reflection appears on the screen.
Set an appropriate tilt angle so that the
reflection of fish school always appears on the screen.
The narrow tilt angle is selected for surface detection, however, if 0° is selected,
sometimes the reflection of the sea surface appears on the screen as the noise and
interferes with observation of wanted echoes.
Adjust an appropriate tilt angle to lessen the effect of sea surface reflection.
The Tilt angle is also set in the Bottom Scan mode and the Echo Sounder mode.