题目内容

The proper operation of the DSC facilities shall be tested by means of a test call, when within communication range coast station fitted with DSC equipment, what is the period?

A. weekly
B. Annually
C. Daily
D. Monthly

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It is possible for ships to receive safety message transmitted by Navtex station _________.

A. in any INMARSAT regions
B. in each NAVAREA
C. at any distance
D. in Areas A3 and A4

What is the approximate range of VHF radio waves propagation?

A. 300 nautical miles
B. 30-50 nautical miles
C. 200 nautical miles
D. 400 nautical miles

_________ belongs to satellite system to promulgate Maritime Safety Information.

AMVER.
B. NAVTEX.
C. SafetyNET.
D. Inmarsat-M SES

In general terms, all the media listed below are used to receive MSI, except _________.

A. NAVTEX.
B. HF NBDP.
C. SafetyNET.
D. MF/HF DSC.