Furuno CH-250 Operator's Manual page 26

2.6.4 Suitable tilt angle
The figure below illustrates the relationship among tilt angle, depth and detection range. Refer to
it to find out the suitable tilt angle for a given depth/detection range.
Tilt angle and beam coverage (frequency 60 kHz, vertical beamwidth 12
20(40)
40(80)
60(120)
80(160)
100(200)
200(400)
Vertical width of sonar beam
12
2-8
100 200
(200) (400)
200 m
100 m 100 m
21 m
Figure 2-9 Tilt angle and beam coverage
300
(600)
300 m
63 m
42 m
)
at -3 dB
Range (m)
400
0
(800)
5
10
15