Sec. 80.1069  Maritime sea areas.

    (a) For the purpose of this subpart, a ship's area of operation is 
defined as follows:
    (1) Sea area A1. An area within the radiotelephone coverage of at 
least one VHF coast station in which continuous DSC alerting is 
available as defined by the International Maritime Organization.
    (2) Sea area A2. An area, excluding sea area A1, within the 
radiotelephone coverage of at least one MF coast station in which 
continuous DSC alerting is available as defined by the International 
Maritime Organization.
    (3) Sea area A3. An area, excluding sea areas A1 and A2, within the 
coverage of an INMARSAT geostationary satellite in which continuous 
alerting is available.
    (4) Sea area A4. An area outside sea areas A1, A2 and A3.
    (b) Maritime sea areas are delineated in the International Maritime 
Organization Publication GMDSS Master Plan of Shore-Based Facilities. 
The Master Plan can be purchased from the International Maritime 
Organization, 4 Albert Embankment, London SE1 7SR, United Kingdom.

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