A.daily testing
B.either A or C
C.operational use of the equipment
D.testing at least every 48 hours
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A.INMARSAT A
B.INMARSAT C
C.SafetyNET
D.NAVTEX
A.VHF
B.SART
C.NAVTEX
D.LES
A.Sea Area A1
B.Sea Area A2
C.Sea Area A3
D.Sea Area A4
A.Search and rescue authorities ashore can be alerted to a distress situation
B.Shipping in the immediate vicinity of a ship in distress will be rapidly alerted
C.Shoreside authorities and vessels can assist in a coordinated SAR operation with minimum delay
D.All of the above
A.No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency
B.The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received
C.The Operator should immediately set continuous watch on VHF channel 70
D.The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received
最新試題
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
Before GMDSS, if the radio officer on board is serious ill,（）.
By using（）system a ship can send a distress message and know with certainty it will be received.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
The vessel has stayed in port for seven days because she needs（）.
Please use（）for（）.
International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
We consider（）send a helicopter with medical facilities to the distress area.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.