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How many digits are there in ship station ' s own unique MMSI which is automatically included in a DSC call?

A. 4 digits.
B. 5 digits.
C. 7 digits.
D. 9 digits.

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_______by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signal.

A. Which is assisted
B. That assists you
C. When you assisted
D. When being assisted

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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

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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.

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How many digits are there in ship station ' s own unique MMSI which is automatically included in a DSC call?

A. 4 digits. B. 5 digits. C. 7 digits. D. 9 digits.

_______by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signal.

In order to avoid all ships in a large sea area being alerted, which message format shall be selected by an operator?

The ARQ mode should be applied___________.

Which emission class may be used for RT in the bands between 4,000 kHz and 27,500kHz?

A. 4 digits.
B. 5 digits.
C. 7 digits.
D. 9 digits.