Furuno SC-50 Operator's Manual page 53

2. OPERATION
3) FREQ is selected; press the [ENT] key.
4) The cursor is selecting the hundredths digit so press ▲ or▼ to display
appropriate digit. Press ► to shift the cursor to the tenths place.
5) Set other digits appropriately.
8. Press the [DISP] key to close the menu.
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