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3. VERTICAL SCAN MODE
3-13
HORZ SCAN RATE: Sets the scan rate (1, 2, 3, 4) for the horizontal display in the
horizontal/vertical scan combination display. For example, if the scan for the horizontal
display is “4” and the scan rate for the vertical scan display is “2”, then for every four scans
at the horizontal display two scans are produced at the vertical scan display. Raise the
figure to give importance to the horizontal display.
VERT SCAN RATE: Sets the scan rate (1, 2, 3, 4) for the vertical scan display in the
horizontal/vertical scan combination display. Raise the figure to give importance to the
vertical display.
HORZ RANGE: You may choose the horizontal range expansion factor for the horizontal
expansion display from x1 or x2. Note that this feature cannot be adjusted when the vertical
search mode or target lock is active.
3.14 Interpreting the Vertical Scan Display
This section provides information necessary for interpreting the vertical scan display.
3.14.1 How the vertical scan 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 chosen manually or automatically.
Sounding Beam Screen Display
Freq: 60 kHz
0°
(1) Bearing of the
sounding beam
Bow
180°
0°
Tilting direction
(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 control
and the display area (3) by the SECTOR control.
(1) Bearing of the
sounding beam
180°
(2) Sector center,
(3) Display area
Sector center 90°.
Display range
24°.
How the vertical scan mode picture is painted