单项选择题

Distress traffic（）all messages relating to the immediate assistance required by the ship in distress, including search and rescue communications and signals for locating.

A.consists of
B.is consisted of
C.consisted of
D.are consisted of

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单项选择题

The transmission of a（）indicates that a ship is in distress and requires immediate assistance.

A.urgent traffic
B.distress alert
C.routine traffic
D.NAVTEX message

单项选择题

The GMDSS is composed of（）.

A.satellite and terrestrial communication systems
B.only navigational and alerting systems
C.just MSI system and locating system
D.SAR co-ordination system

单项选择题

MSI is broadcast via（）.

A.NAVTEX
B.EGC
C.HF-telex
D.all of above