Which of the following frequencies have not been designated for on-scene communications in the Global Maritime Distress and Safety System?
A. VHF CH16
B. MF 2182kHz for radiotelephony
C. VHF CH11
D. MF2174.5kHz for NBDP
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What is the minimum information which a DSC distress alert shall contain?
A. Identification and position of the station in distress
B. Identification and call sign of the station in distress
C. Identity of the station in distress and the number of crewmembers
D. Identity of the station in distress and the kind of help required
Which of the following determine(s) whether a NAVTEX message is rejected or received?
A. B3B4numbers from 01 to 99.
B. The start group in NAVTEX messages: ZCZC”.
C. Subject indicator and transmitter identity.
D. The end group in NAVTEX messages: NNNN”.
The task of _________ can not be executed by the holder of GMDSS General Operator's Certificates.
A. any adjustments or maintenance， which may affect the proper operation of the MF/HF radio station.
B. replacement of consumable items such as paper， ribbons， etc.
C. resetting tripped circuit breakers or replacing defective fuses.
D. routine battery maintenance， if used as part of the GMDSS station.
Regarding the NAVTEX system, _________is not true.
A. NAVTEX is a single frequency broadcast system (using NBDP narrow band direct printing) Telex on 518 kHz.
B. A selective message -rejection feature of the receiver allows the mariner to receive only that safety information pertinent to his requirements.
C. NAVTEX must be broadcast in the prevailing language of the coast station only.
D. NAVTEX carries information relevant to all sizes and types of vessels within a region established for this service.
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