单项选择题
When the GMDSS Radio Operator on watch hears“SECURITE”spoken three times he can expect to receive a message concerning（）.
A.The safety of navigation or important meteorological warnings
B.The safety of a vessel or a person is in jeopardy
C.A vessel in need of immediate assistance
D.A coast station traffic list
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相关考题
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单项选择题
What publications should a GMDSS Operator consult regarding the proper set-up and operation of vessel equipment（）.
A.ITU Publications
B.The manufacturers instruction manuals
C.Part 90 of the FCC Rules and Regulations
D.Code of Federal Regulations，Title 47，Part 80，Subpart W -
单项选择题
The data travels from the（）to the INMARSAT Network Coordination Station（NCS）and then down to the SES’s on ships at sea.
A.VHF
B.SART
C.NAVTEX
D.LES -
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
