Suitable Tilt Angle - Furuno CHS-5LMARK-2-55 Operator's Manual

sound is reflected just like a light hitting a mirror at a narrow incident angle, it propa-
gates away and the sea surface reflections become negligible.
However if the sea is not calm enough, they will become dominant and will interfere
with observation of wanted echoes. To minimize these sea surface reflections and to
search surface schools of fish effectively, the tilt angle is usually set to 5-6 degrees so
that the upper portion of the beam becomes almost parallel with the sea surface.
When the sea is rough, it is often set to a little larger angle.
*: 15° for CSH-5LMARK-2, 13° for CSH-8LMARK-2
Tilt angle and surface fish (example: CSH-5LMARK-2)
1.4.6

Suitable tilt angle

The table below shows the estimated detection range for tilt angles of 0, 5, 10 and
15 degrees. Refer to the table to find suitable tilt angle from depth and detection range.
Tilt angle setting
20(40)
40(80)
60(120)
80(160)
100(200)
200(400)
Vertical width of sonar beam
Tilt angle 0°
Tilt angle 5-6°
100
(200)
100 m
15° 26 m
100 m
13° 23 m
Depth, detection range and tilt angle
Sea surface
15°
Sea surface
15°
200 300
(400) (600)
300 m
200 m
52 m 78 m
300 m
200 m
46 m 68 m
1. OPERATIONAL OVERVIEW
Detection range (m)
400
(800)
CSH-5LMARK-2
CSH-8LMARK-2
0°
5°
10°
15°
1-13