In order to avoid all ships in a large sea area being alerted, which message format shall be selected by an operator?
Area call.
B. Distress call.
C. Urgency call.
DSC call.
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The ARQ mode should be applied___________.
A. when two stations communicate with each other
B. in any radio system at any time
C. when one ship sends messages to another
D. for communication Among some stations
Which emission class may be used for RT in the bands between 4,000 kHz and 27,500kHz?
A. J3E.
B. G2B.
C. A1A.
D. F1B or J2B.
Every ship _________on or after 1 February 1995 shall comply with all the applicable requirements of Chapter four.
A. constructs
B. constructed
C. has constructed
D. was constructed
SOLAS vessels should be able to communicate with shore stations_______ according to the SOLAS Convention.
A. in major ocean regions and at regular times
B. in case of distress
C. at any time and from any location
D. on fixed position and scheduled time