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A.A conditional or partial exemption may be granted，in exceptional circumstances，for a single voyage outside the sea area for which the vessel is equipped
B.Once a compulsory vessel's GMDSS station has been fitted and inspected，the station must be inspected only once every five years
C.All passenger vessels and all cargo vessels that are 300 Gross Tons or larger must comply
D.Compulsory vessels must carry at least two licensed GMDSS Radio Operators

A.When the vessel is in an overloaded condition
B.When the vessel has arranged for both duplication of equipment AND shore-based maintenance
C.When the vessel has replaced a required piece of GMDSS-related equipment but its performance has not been verified or logged
D.When the vessel is carrying only two licensed GMDSS Radio Operators and is capable of performing all required functions