Sec. 80.93  Hours of service.

    (a) All stations. All stations whose hours of service are not 
continuous must not suspend operation before having concluded all 
communication required in connection with a distress call or distress 
traffic.
    (b) Public coast stations. (1) Each public coast station whose hours 
of service are not continuous must not suspend operation before having 
concluded all communication involving messages or calls originating in 
or destined to mobile stations within range and mobile stations which 
have indicated their presence.
    (2) Unless otherwise authorized by the Commission upon adequate 
showing of need, each public coast station authorized to operate on 
frequencies in the 3000-23,000 kHz band must maintain continuous hours 
of service.
    (c) Compulsory ship stations. Compulsory ship stations whose service 
is not continous may not suspend operation before concluding all traffic 
originating in or destined for public coast stations situated within 
their range and mobile stations which have indicated their presence.
    (d) Other than public coast or compulsory ship stations. The hours 
of service of stations other than public coast or compulsory ship 
stations are determined by the station licensee.