Interpreting The Vertical Fan Display - Furuno CH-250 Operator's Manual

3.13 Interpreting the Vertical Fan Display

This section provides information necessary for interpreting the vertical fan display.
3.13.1 How the vertical fan mode picture is painted
The sounding beam is emitted and the information (target echoes) obtained by the beam
appears in the corresponding sector as it appears on the sonar mode. The difference is that the
training is performed only in vertical direction. It forms a sounding area of a half-circle (like a slice
of watermelon) to observe a vertical section of underwater conditions.
The bearing of the vertical sounding beam can be selected manually or automatically.
Sounding Beam
Bow
180
(2) Sector center
(3) Display area
Select the bearing of the sounding beam (1) by [TRAIN]
control, the sounding sector center (2) by the [TILT] con-
trol and the display area (3) by the [SECTOR] control.
Figure 3-17 How the vertical fan mode picture is painted
(1) Bearing of the
sounding beam
0
Tilting direction
Freq: 60 kHz
(1) Bearing of the
180
Screen Display
sounding beam
0
Sector center 90
Display range
24
(2) Sector center,
(3) Display area
3-13