Furuno CSH-23F/24F manual Using Vertical Scanning Display

VERTICAL SCANNING DISPLAY

The vertical scanning display provides a wide fish eye view of underwater conditions from the surface to the seabed. The fig- ure below illustrates the concept of the vertical scanning mode, in comparison with the normal sonar beam. The vertical scan- ning mode helps you keep fast moving fish such as bonito and tuna within the sonar beam.

Figure 8-1 The concept of the vertical scanning mode

Using Vertical Scanning Display

1.Press the VERT SCAN key on the main panel. The lamp above the switch lights, indicat- ing that the vertical scanning function is ON.

2.Press the TILT/SCAN lever to set a scan- ning depth. Your selection appears at the upper right-hand corner of the display like “D120M”. Select a scanning depth which does not display the seabed, so you won’t hide any echoes in the seabed. When the seabed is hard and rocky, it may appear even if may appear even if the scanning depth is set shallower than the seabed depth. In such case, set the scanning depth further shallower.

3.To suppress sea surface reflections, open the data setting window and set the VER

BEAM in the SONR•BEAM item to other than 0. Upper part of the beam dents as shown at right.

4.To escape from the vertical scanning mode, press the VERT SCAN key.

Figure 8-2 Vertical scanning

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