单项选择题

The（）provides the link between the Space Segment and the land-based National/International fixed communications networks.

A.VHF
B.SART
C.NAVTEX
D.LES

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单项选择题

Reliable delivery of messages is ensured by（）techniques.

A.forward error correction
B.aftward error correction
C.DGPS
D.error-free and low error reception

单项选择题

How long must the GMDSS radio log be retained on board（）.

A.At least two years after the last entry
B.At least one year after the last entry
C.At least 90 days after the last entry
D.At least 30 days after the last entry

单项选择题

Each satellite broadcasts（）traffic on a designated channel.

A.LES
B.ESA
C.NCS
D.EGC