[单项选择]If a GMDSS radio operator initiates a DSC distress transmission but does not insert a message，what happens? （）
A. The transmission is aborted and an alarm sounds to indicate this data must be provided by the operator
B. The transmission is not initiated and "ERROR" is indicated on the display readout
C. The transmission will be made with "default" information provided automatically
D. The receiving station will poll the DSC unit of the vessel in distress to download the necessary information

[单项选择]Which statement concerning GMDSS Radio Operator requirements is FALSE（）.
A. Each compulsory vessel must carry at least two licensed GMDSS Radio Operators at all times while at sea
B. Each compulsory vessel must carry at least two licensed Radio Operators at all times while at sea and may elect to carry a GMDSS Radio Maintainer as well
C. Communications involving safety of life at sea do not have to be logged as long as the compulsory vessel was not involved in such communications
D. While at sea，adjustments to，and the maintaining of，GMDSS equipment may be performed by the GMDSS Radio operator as long as the work is supervised by an onboard licensed GMDSS Radio Maintainer

[单项选择]Which maintenance functions can a GMDSS Radio Operator perform（）.
A. The Operator can make fine internal adjustments to the transmitter as long as the output power does not change by more than one percent
B. The Operator is responsible for ensuring that INMARSAT antennas are free of built-up soot and clear of obstacles
C. All levels of maintenance must be performed by a licensed GMDSS Radio Maintainer
D. The Operator may install an EPROM in order to ensure that the equipment continues to operate within legal constraints

[单项选择]How long must GMDSS Radio Logs be retained by the licensee when they relate to a distress situation or disaster? （）
A. 6 months
B. 1 year
C. 2 years
D. 3 years

[单项选择]Where should the GMDSS radio log be kept on board ship（）.
A. In the Captain's office
B. In the sea cabin
C. At the GMDSS operating position
D. Anywhere on board the vessel

[单项选择]How long must the GMDSS radio log be retained on board（）.
A. At least two years after the last entry
B. At least one year after the last entry
C. At least 90 days after the last entry
D. At least 30 days after the last entry

[单项选择]What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received? （）
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

[单项选择]When the GMDSS Radio Operator on watch hears“SECURITE”spoken three times he can expect to receive a message concerning（）.
A. The safety of navigation or important meteorological warnings
B. The safety of a vessel or a person is in jeopardy
C. A vessel in need of immediate assistance
D. A coast station traffic list

[单项选择]In the GMDSS, distress alerting can be transmitted in（）directions.
A. 1
B. 2
C. 3
D. 4

[单项选择]Distress and safety communications following DSC calling will be performed by radiotelephony or（）.
A. NBDP
B. EGC receiver
C. NBDP or both
D. EGC receiver or both

[单项选择]DSC distress acknowledgements are normally transmitted by（）in respond to a receiver DSC distress call.
A. Ship stations
B. Coast stations
C. NCSs
D. NCC

[单项选择]A vessel in distress should send by radio telephone the two tone alarm signal followed immediately by the（）.
A. Distress position
B. Spoken words“Mayday，Mayday，Mayday”
C. Ship's name
D. Ship's call letters

[单项选择]Before GMDSS, if the radio officer on board is serious ill,（）.
A. someone else will take his place
B. the captain will take charge of his work
C. nobody will be capable of doing his work
D. anyone else will use the radio equipment

[单项选择]DSC distress relays can be transmitted by either（）or（）.
A. a coast station/a ship station
B. an EPIRB/a SART
C. ARQ/FEC
D. a back-up satellite/a land SAR unit

[单项选择]We（）the distress signal on our own radio before the shore station relayed it to us.
A. received alreadly
B. have received
C. had received
D. was receiving

[单项选择]What does the DSC control unit do if the GMDSS radio operator fails to insert updated information when initiating a DSC distress alert（）.
A. It will abort the transmission and set off an audible alarm that must be manually reset
B. It will initiate the DSC distress alert but，as no information will be transmitted，rescue personnel will not be able to identify the vessel，its position or its situation
C. It will initiate the DSC distress alert and default information will automatically be transmitted
D. It will initiate the DSC distress alert，but any station receiving it will have to establish contact with the distressed vessel to determine its identity，position and situation