According to the passage, the comply

单选题 According to the passage, the complying vessel may transmit ship-to-shore distress alert by____in sea area A1.

A、 HF DSC

B、 VHF DSC

C、 406 MHz EPIRB

D、 VHF DSC and 406 MHz EPIRB

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单选题 According to the passage, the complying vessels may transmit ship-to-shore distress alert by____in sea area A4.

A、HF DSC

B、MF DSC

C、406 MHz EPIRB

D、HF DSC and 406 MHz EPIRB

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单选题 When it works in GEOS system, how to determine the position of the ship in distress?

A、To be measured by Doppler Shift.

B、GPS on board will provide the information.

C、GEOSTAR system can calculate.

D、It must be encoded by GMDSS operator.

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单选题 Maritime Safety Information ____international SafetyNET service and NAVTEX service.

A、consists of

B、can be received by

C、is broadcast by

D、is made on

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单选题 How many directions are there distress alerts in GMDSS?

A、One.

B、Two.

C、Three.

D、Four.

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单选题 Where are GOES weather satellites?

A、They are located at equator.

B、They are located at geomagnetic equator.

C、They are located at the celestial equator.

D、They are located in geostationary orbit.

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单选题 Which of the following is not true?

A、Transmission of ship-to-shore distress alerts by at most two separate and independent means.

B、Transmission of ship-to-shore distress alerts should use a different radiocommunication service.

C、The secondary means could be an EPIRB on sea area A1 and A4 vessel.

D、The secondary means could be an EPIRB on sea area A2 and A3 vessel.

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单选题 Other communications are permitted on frequency(s)____

A、121.5 MHz

B、406 MHz

C、both 121.5 MHz and 406 MHz

D、none of 121.5 MHz and 406 MHz

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单选题 According to this passage, the coverage of 406 MHz system is____

A、near globe

B、between 70°N and 70°S

C、there is no range limitation anywhere in the world

D、only at sea

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