Sec. 80.103  Digital selective calling (DSC) operating procedures.

    (a) Operating procedures for the use of DSC equipment in the 
maritime mobile service are as contained in CCIR Recommendation 541 as 
modified by paragraph (c) of this section.
    (b) When using DSC techniques, coast and ship stations must use nine 
digit maritime mobile service identities.
    (c) DSC acknowledgement of DSC distress and safety calls must be 
made by designated coast stations and such acknowledgement must be in 
accordance with procedures contained in CCIR Recommendation 541. 
Nondesignated public and private coast stations must follow the guidance 
provided for ship stations in CCIR Recommendation 541 with respect to 
DSC ``Acknowledgement of distress calls'' and ``Distress relays''.