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2. HORIZONTAL MODE
2-53
2.23.3 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
decreased tilt angle is used, sea surface reflections cover a large area as
illustrated below.
Sea surface
Sea surface
18
°
Tilt angle
indication
Sea surface
reflections
18
°
Tilt: 0
°
Tilt: 8
°
-9
°
Sea surface reflections
2.23.4 Wake
A wake produced by own ship or another ship can be a strong reflecting object
when a decreased tilt angle is used. As the wake appears as a thick continuous
line, it can be easily distinguished from a fish school. A wake contains many air
bubbles which attenuate ultrasonic energy, making it difficult to sound beyond
the wake.
Own
ship
Other
ship
Wake produced
by other ship
Own ship's
screw noise
Own ship's
screw noise
Own ship's wake
(produced when
own ship turned)
Wake