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單項選擇題

（）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

單項選擇題

What is the basic concept of GMDSS? （）

A.Search and rescue authorities ashore can be alerted to a distress situation
B.Shipping in the immediate vicinity of a ship in distress will be rapidly alerted
C.Shoreside authorities and vessels can assist in a coordinated SAR operation with minimum delay
D.All of the above