（）is an area within the radiotelephone coverage of at least one VHF coast station in which continuous Digital Selective Calling is available.<br>A:Sea Area A1<br>B:Sea Area A2<br>C:Sea Area A3<br>D:Sea Area A4

（）is an area within the radiotelephone coverage of at least one VHF coast station in which continuous Digital Selective Calling is available.
A:Sea Area A1
B:Sea Area A2
C:Sea Area A3
D:Sea Area A4

出自：海船船员证

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