Furuno CH-250 - Manual (Page 101)

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5.4.10 Transducer frequency adjustment
If the CH-250 is receiving interference from a video sounder or other sonar on board your ship,
adjust the frequency of the CH-250’s transducer to reduce the interference.
60.0 kHz (57-63 kHz) FREQ SHIFT :
: CHANGE MENU: END
** TX FREQ ADJUST **
Figure 5-21 TX frequency adjustment menu
5.4.11 Demonstration mode
The demonstration mode provides a simulated sonar picture which helps you become
acquainted with how your sonar works. Connection of the transducer is not required. All controls
are operational.
1. Display the SYS menu.
2. Select DEMO MODE.
3. Press to open the menu.
OFF ON DEMO MODE :
: CHANGE MENU: END
** DEMO MODE **
Figure 5-22 Demo mode menu
4. Select OFF or ON as appropriate and press the [MENU] key. (DEMO) appears at the top of
the screen when the demonstration mode is active.