Furuno FS-1570 - Manual (Page 22)

1 OPERATIONAL OVERVIEW
1-8
1.9.4 Automatic setting of working frequency
The radiotelephone automatically sets working frequency in the following conditions:
• ABLE ACK is sent in response to individual call.
• Your ship receives ABLE ACK in response to own ship-initiated individual call.
• Your ship sends all ship call.
• Your ship sends distress relay.
• Your ship sends distress alert.
• Your ship receives group call or area call.
• Your ship receives distress relay call.
• Your ship receives distress alert.