Furuno FSV-30, Operator'S Manual

Page: 41 / 190

2. HORIZONTAL MODE
2-11
2.4.5 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.
Range(m)
Vertical width of sonar beam
18
°
31 m
100 m 100 m
300 m
93 m
200 m
Depth (m)
62 m
Tilt angle and beam coverage (vertical beamwidth 18
°
at -6dB )
100
(200)
200
(400)
300
(600)
400
(800)
Tilt 0
˚
(0˚
‑
9˚)
20(40)
40(80)
60(120)
80(160)
100(200)
200(400)
Tilt 5
˚
(0˚ ‑ 14˚)
Tilt 15 ˚
(6˚ ‑ 24˚)
Grey: Tilt 10 ˚
(1˚ ‑ 19˚)
(-6dB)
Tilt angle and beam coverage
2.5 Finding Range and Bearing to a Target
Operate the trackball to place the trackball mark on the target you want to
measure the range and bearing. The range, bearing and depth to the target
appear at the upper left corner of the screen.
B
Trackball mark
TRACKBALL DATA
Slant range
Horizontal range
Depth
B Relative or
True bearing*
*True bearing requires
appropriate sensor.
34
°
56.789N
123
°
45.678E
Trackball mark
position
Location of trackball data