Furuno CH-300 Operator's Manual page 20

1. OPERATIONAL OVERVIEW
Frequency selection and mode
Single-frequency display or combination display (other than vertical scan
combination): The LF/HF key chooses low frequency or high frequency alternately.
Dual-frequency display (mix mode OFF): The LF/HF key switches the frequency of the
high-and low-frequency displays alternately.
Dual-frequency display (mix mode ON): The LF/HF key changes the frequency of the
left-hand display* (top display in dual-frequency vertical scan display) from low to high
alternately.
* Dual-frequency horizontal display, Dual-frequency horizontal expansion display,
Dual-frequency echo sounder display.
LOW-FREQ. MIX HIGH-FREQ. MIX
LF/HF key
DISPLAY DISPLAY DISPLAY DISPLAY
Frequency switching in dual-frequency combination display, mix display ON
Combination display (vertical scan combination):
Main window is active: The LF/HF key changes the frequency of the main window from low
to high alternately.
Sub window is active: The LF/HF key changes the frequency of the sub window from low to
high alternately.
To switch between main and sub windows use the MAIN/SUB key.
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