Furuno Felcom 15 Operator's Manual page 57

2. SYSTEM INITIALIZATION
Note: If the ID or frequency entered is invalid the message "Input Error:
NCS ID" (for invalid ID) or "Input Error: Channel No." (for invalid
frequency) appears. Clear the error message by pressing the [Esc]
key. Place the cursor at the invalid ID or frequency code. Then, press
the [Enter] key and enter correct ID or frequency.
14. Press the [Esc] key twice to return to the standby display.
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