GMDSS GOC Flashcards: Radio Concepts and Terminology

このデッキのカード

1. カード 1

   質問

   In maritime radio, what does GMDSS stand for?

   回答

   Global Maritime Distress and Safety System.

2. カード 2

   質問

   In the CEPT maritime-radio syllabus, what does GOC stand for?

   回答

   General Operator’s Certificate.

3. カード 3

   質問

   What does a radio frequency of 1 Hz represent?

   回答

   One cycle per second.

4. カード 4

   質問

   In GMDSS, what does MSI stand for?

   回答

   Maritime Safety Information.

5. カード 5

   質問

   Which international organisation develops the maritime safety framework behind GMDSS?

   回答

   The International Maritime Organization (IMO).

6. カード 6

   質問

   Which international organisation maintains the Radio Regulations used by maritime radio services?

   回答

   The International Telecommunication Union (ITU).

7. カード 7

   質問

   GMDSS combines which two broad communication paths?

   回答

   Terrestrial radio and satellite communication.

8. カード 8

   質問

   In maritime radio, what does DSC stand for?

   回答

   Digital Selective Calling.

9. カード 9

   質問

   Which maritime emergency category means grave and imminent danger requiring immediate assistance?

   回答

   Distress.

10. カード 10

    質問

    What is the purpose of NAVTEX?

    回答

    Automatic reception of broadcast maritime safety information as text.

11. カード 11

    質問

    In maritime radio, what does MMSI stand for?

    回答

    Maritime Mobile Service Identity.

12. カード 12

    質問

    In maritime satellite communications, what does SES stand for?

    回答

    Ship Earth Station: the satellite-communication station aboard a ship.

13. カード 13

    質問

    In maritime safety, what does EPIRB stand for?

    回答

    Emergency Position-Indicating Radio Beacon.

14. カード 14

    質問

    How many hertz are in 1 kHz?

    回答

    1000 Hz.

15. カード 15

    質問

    In maritime communications, what does SAR stand for?

    回答

    Search and Rescue.

16. カード 16

    質問

    What is the basic role of maritime DSC?

    回答

    Establishing contact and transferring calling or alert information using digital codes.

17. カード 17

    質問

    In radio spectrum terminology, what does MF mean?

    回答

    Medium frequency: 300 kHz to 3 MHz.

18. カード 18

    質問

    What is the international NAVTEX frequency?

    回答

    518 kHz.

19. カード 19

    質問

    How many digits does an MMSI contain?

    回答

    Nine digits.

20. カード 20

    質問

    Which category concerns an urgent safety message without the distress condition requiring immediate assistance?

    回答

    Urgency.

21. カード 21

    質問

    In radio spectrum terminology, what does HF mean?

    回答

    High frequency: 3 to 30 MHz.

22. カード 22

    質問

    In GMDSS, what does RMSS mean?

    回答

    Recognised Mobile Satellite Service: a satellite service recognised by IMO for GMDSS.

23. カード 23

    質問

    How many kilohertz are in 1 MHz?

    回答

    1000 kHz.

24. カード 24

    質問

    In a NAVTEX header, what does B1 identify?

    回答

    The transmitter.

25. カード 25

    質問

    In radio spectrum terminology, what does VHF mean?

    回答

    Very high frequency: 30 to 300 MHz.

26. カード 26

    質問

    Which category announces navigation-safety information or important meteorological warnings?

    回答

    Safety.

27. カード 27

    質問

    Which radio coverage defines GMDSS sea area A1?

    回答

    VHF coast-station voice coverage with continuous DSC alerting, as defined by a Contracting Government.

28. カード 28

    質問

    What do the Maritime Identification Digits in an MMSI identify?

    回答

    The administration with jurisdiction over the station.

29. カード 29

    質問

    In a NAVTEX header, what does B2 identify?

    回答

    The message subject category.

30. カード 30

    質問

    Which spoken maritime radio signal denotes distress?

    回答

    MAYDAY.

31. カード 31

    質問

    Which radio coverage defines GMDSS sea area A2?

    回答

    MF coast-station voice coverage with continuous DSC alerting, outside A1, as defined by a Contracting Government.

32. カード 32

    質問

    What atmospheric region enables HF skywave communication beyond the horizon?

    回答

    The ionosphere.

33. カード 33

    質問

    What do the B3B4 characters in a NAVTEX header represent?

    回答

    The two-digit message number.

34. カード 34

    質問

    Which spoken maritime radio signal denotes urgency?

    回答

    PAN PAN.

35. カード 35

    質問

    Since 1 January 2024, what determines a ship’s GMDSS sea area A3?

    回答

    Its carried ship earth station’s recognised mobile satellite service coverage with continuous alerting, outside A1 and A2.

36. カード 36

    質問

    Which language is used by the international NAVTEX service on 518 kHz?

    回答

    English.

37. カード 37

    質問

    In ITU radio terminology, how do the two directions operate in simplex communication?

    回答

    Alternately: one direction transmits at a time.

38. カード 38

    質問

    Which spoken maritime radio signal introduces safety traffic?

    回答

    SÉCURITÉ (SECURITE).

39. カード 39

    質問

    How is GMDSS sea area A4 defined?

    回答

    The area outside A1, A2 and that ship’s A3.

40. カード 40

    質問

    Which NAVTEX subject category does B2 = A represent?

    回答

    Navigational warnings.

41. カード 41

    質問

    In ITU radio terminology, what does duplex operation permit?

    回答

    Simultaneous transmission in both directions.

42. カード 42

    質問

    What is the priority order of distress, urgency, safety and routine radio traffic?

    回答

    Distress → urgency → safety → routine.

43. カード 43

    質問

    Which marine VHF channel is reserved for DSC?

    回答

    Channel 70, 156.525 MHz; it is not a voice channel.

44. カード 44

    質問

    Which NAVTEX subject category does B2 = B represent?

    回答

    Meteorological warnings.

45. カード 45

    質問

    Which frequency band identifies the satellite distress-alerting function of a modern EPIRB?

    回答

    406 MHz.

46. カード 46

    質問

    What are bridge-to-bridge communications in GMDSS terminology?

    回答

    Safety radio communications between ships from their navigating positions.

47. カード 47

    質問

    Which marine VHF channel carries radiotelephony distress and safety traffic?

    回答

    Channel 16, 156.8 MHz.

48. カード 48

    質問

    Which NAVTEX subject category does B2 = E represent?

    回答

    Meteorological forecasts.

49. カード 49

    質問

    What does integrated GNSS add to an EPIRB distress alert?

    回答

    An encoded position from a Global Navigation Satellite System, helping rescuers locate the beacon.

50. カード 50

    質問

    Which GMDSS communication function concerns units at the incident location?

    回答

    On-scene communications.

51. カード 51

    質問

    Which MF frequency is used for DSC distress and safety calling?

    回答

    2187.5 kHz.

52. カード 52

    質問

    Which NAVTEX subject category does B2 = C represent?

    回答

    Ice reports.

53. カード 53

    質問

    Why does accurate EPIRB registration help rescue authorities?

    回答

    It links the beacon identity to vessel and contact information.

54. カード 54

    質問

    What is the purpose of a GMDSS reserve source of energy?

    回答

    Powering distress and safety radio equipment if main and emergency electrical supplies fail.

55. カード 55

    質問

    Which MF frequency is used for radiotelephony distress and safety communications?

    回答

    2182 kHz.

56. カード 56

    質問

    Name the lower-frequency national NAVTEX channel distinct from international 518 kHz.

    回答

    490 kHz; availability and language depend on the national service.

57. カード 57

    質問

    What is the role of an EPIRB’s low-power 121.5 MHz signal?

    回答

    Local homing by rescue units; Cospas-Sarsat satellites no longer process 121.5 MHz alerts.

58. カード 58

    質問

    Does the CEPT GOC syllabus assess theory alone?

    回答

    No. It requires theoretical and practical tests.

59. カード 59

    質問

    At the same wave speed, what happens to wavelength when frequency rises?

    回答

    Wavelength becomes shorter.

60. カード 60

    質問

    In maritime satellite safety broadcasts, what does EGC stand for?

    回答

    Enhanced Group Call.

61. カード 61

    質問

    What is the purpose of a float-free EPIRB’s hydrostatic release?

    回答

    Releasing the beacon from its bracket when submerged, so it can float free.

62. カード 62

    質問

    Why does GMDSS communication planning consider the whole voyage?

    回答

    Service coverage, relevant stations and safety-information areas can change along the route.

63. カード 63

    質問

    What is the standard ship-station MMSI pattern, using MID and X placeholders?

    回答

    MIDXXXXXX: three Maritime Identification Digits followed by six digits.

64. カード 64

    質問

    Which named Inmarsat service broadcasts maritime safety information?

    回答

    SafetyNET.

65. カード 65

    質問

    Does a beacon Return Link Service (RLS) indication mean a rescue has been launched?

    回答

    No. It confirms receipt, localisation and forwarding of the alert, not launch of a rescue.

66. カード 66

    質問

    Two ships share a position outside A1/A2 but carry different RMSS terminals. Must their A3 coverage match?

    回答

    No. A3 depends on the RMSS supported by each ship’s carried earth station.

67. カード 67

    質問

    What is the coast-station MMSI pattern, using MID and X placeholders?

    回答

    00MIDXXXX: two leading zeros, the MID, then four digits.

68. カード 68

    質問

    Which named Iridium service broadcasts maritime safety information?

    回答

    SafetyCast.

69. カード 69

    質問

    Why use an EPIRB’s approved self-test instead of ordinary activation for practice?

    回答

    Ordinary activation can transmit a real distress alert and divert rescue resources.

70. カード 70

    質問

    What is a NAVAREA used to coordinate?

    回答

    Navigational warnings for a defined sea area.

71. カード 71

    質問

    What is the primary role of a radar SART?

    回答

    Helping nearby rescue units locate survivors through a radar response. SART means Search and Rescue Transponder.

72. カード 72

    質問

    A training question asks for voice transmission on VHF channel 70. What is the conceptual error?

    回答

    Channel 70 is for DSC, not radiotelephony.

73. カード 73

    質問

    What is a METAREA used to coordinate?

    回答

    Marine meteorological warnings and forecasts for a defined sea area.

74. カード 74

    質問

    Which IAMSAR volume is intended for vessels and other mobile facilities?

    回答

    Volume III, Mobile Facilities.

75. カード 75

    質問

    Why can an HF link become unreliable during disturbed space weather?

    回答

    Changes in the ionosphere can degrade or disrupt HF propagation.

76. カード 76

    質問

    Which radar band does a GMDSS radar SART use?

    回答

    9.2–9.5 GHz, in the 9 GHz/X-band radar region.

77. カード 77

    質問

    Why is preventing false distress alerts a safety issue?

    回答

    False alerts can divert search-and-rescue resources from real emergencies.

78. カード 78

    質問

    Does receiving a NAVTEX transmitter’s signal prove that every received warning concerns the ship’s position?

    回答

    No. Radio coverage and the transmitter’s defined service area are different concepts.

79. カード 79

    質問

    A training display says an RLS alert was received. What rescue outcome must not be inferred?

    回答

    That rescue units have already been dispatched or will arrive at a particular time.

80. カード 80

    質問

    How does an AIS-SART provide a locating signal?

    回答

    By transmitting search-and-rescue locating information on Automatic Identification System (AIS) frequencies.

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GMDSS GOC Flashcards: Radio Concepts and Terminology

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