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Check yourself

1. Please write the acronym DSC in full.

2. What is defined as the area within the radiotelephone coverage area of at least one VHF coast station in which continuous DSC alerting is available as defined by the IMO regulation for GMDSS?

a) Sea Area A1.

b) Ocean Area Regions AOR-E, AOR-W, POR or IOR.

c) Sea Area A2.

d) Coastal and Inland Waters.

3. What is defined as an area, excluding sea area A1, within the radiotelephone coverage area of at least one MF coast station, in which continuous DSC alerting is available as defined by the IMO?

a) Sea Area A4.

b) Sea Area A3.

c) Sea Area A2.

d) Ocean Area Regions AOR-E, AOR-W, POR or IOR.

4. What is defined as an area, excluding sea areas A1 and A2, within the coverage of an INMARSAT geostationary satellite in which continuous alerting is available?

a) Ocean Area Regions AOR-E, AOR-W, POR or IOR.

b) Sea Area A3.

c) Sea Area A4.

d) Coastal and Inland Waters.

5. Which of the following is not a DSC watch frequency?

a) 2187.5 kHz. b) 6312 kHz. c) 12577 kHz. d) 2182 kHz.

6. Which channel is designated for GMDSS Digital Selective Calling?

a) Channel 06 (156.300 MHz).

b) Channel 13 (156.650 MHz).

c) Channel 16 (156.800 MHz).

d) Channel 70 (156.525 MHz).

7. Which types od DSC calls are available on ch.70 ?

a) Distress and Safety b) Public correspondence c) Calls to Coast Guard d) All DSC calls

8. What is the primary purpose for Digital Selective Calling (DSC)?

a) DSC provides reception of weather and navigational warnings plus search and rescue information

b) DSC provides low-cost, routine communications for the vessel operator.

c) DSC is to be used for transmitting and receiving distress alerts to and from other ships or coast radio stations via radio.

d) This aids SAR authorities in tracking a vessel's position by satellite.

9. A DSC call with the MMSI number 003669991 is:

a) A vessel operating in Sea Area A3.

b) A group call.

c) A coast station.

d) An Intercoastal

10. What is the minimum of information which a DSC distress alert shall contain?

a) Identification of the station in distress, the nature of accident and its position

b) Identification of the station in distress and call sign

c) Identity of the station in distress and the number of crew members

d) Identity of the station in distress and the kind of help required.

11. Which of the following statements concerning DSC equipment is true?

a) The GMDSS Radio Operator is responsible for proper selecting of HF DSC guard channels.

b) All equipment must be type accepted.

c) The vessel's navigational position must be updated, either automatically or manually, no less often that every four (4) hours.

d) All of the above.

12. Which one of the following channels and modes should be used when initiating a distress alert transmission?

a) Channel 6 DSC.

b) Channel 6 Radiotelephony.

c) Channel 13 Radiotelephony and channel 16 DSC.

d) Channel 70 DSC.

13. What action should take a GMDSS Radio Operator 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 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 frequency band on which the distress alert was received.

14. What is the purpose of a DSC control unit?

a) It decodes and displays the message.

b) It will store the message internally until manually retrieved.

c) It will automatically acknowledge routine DSC calls.

d) All of the above.

15. How many total frequencies are available for DSC distress alerting?

a) One (1). b) Two (2). c) Five (5). d) Seven (7).

16. Which one of the following a compulsory watches must vessel maintain when sailing in Sea Area A1?

a) A continuous DSC watch on 8414.5 kHz plus one other HF DSC frequency.

b) A continuous DSC watch on 2187.5 kHz.

c) A continuous DSC watch on Channel 16.

d) A continuous DSC watch on Channel 70.

17. When must a compulsory equipment vessel carry that is capable of DSC alerting and reception in the MF band?

a) When operating within Sea Area A1.

b) Only when operating outside Sea Area A1.

c) Anytime at sea.

d) All of the above.

18. What is the fundamental purpose of a coast radio station?

a) To provide a delivery service for ships with routine, safety, urgency, or distress message traffic.

b) To automatically connect a vessel placing an INMARSAT call with the station being called.

c) To coordinate search and rescue communications.

d) To provide continuous digital selective calling coverage.

19. A DSC call with the MMSI number 027311111 is:

a)A vessel operating in Sea Area A3. b) A group call of ships. c) A U.S. coast station. d) An Intercoastal vessel.

UNIT 3

I. Read and translate the following text

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