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GMDSS GOC Flashcards: Radio Concepts and Terminology

80 original English cards for maritime radio trainees: GMDSS terms, current sea-area concepts, selected channels, identification, MSI and alerting distinctions.

Автор Open Study Contributor

За това тесте

Practise 80 original English concept cards for GMDSS GOC revision. The scope is a selected theory subset referenced to the active CEPT ERC/DEC/(99)01 Annex 1 syllabus, amended 8 March 2024. It is not a complete GOC course or a national examination guide. Reviewed for 2026; sea-area concepts reflect the SOLAS changes effective 1 January 2024.

Recall a term’s meaning or function, identify selected channel/frequency uses, interpret basic MMSI patterns and NAVTEX header fields, and distinguish concepts in six short reasoning prompts. Selected applications revisit DSC channel use, HF propagation, ship-specific A3 coverage, NAVTEX coverage versus service area, voyage planning and the limits of beacon return-link confirmation. Basics come before dependent cases; related variants are separated by at least three unrelated cards. The app schedules later repetition. Public tags are gmdss plus basics, radio, safety-info or alerting.

Excluded: complete emergency scripts and action sequences; distress acknowledgement, relay and cancellation procedures; live testing; equipment operation or repair; full communication drills; national eligibility, renewal and carriage rules; billing and complete examination coverage. Those tasks need current approved training, vessel procedures, publications and the actual equipment manual. Flashcard recall does not establish practical competence, certification or readiness to manage an emergency.

All questions and answers were independently written with AI assistance and checked against public authoritative factual sources. The cover is an original AI-generated illustration, not an equipment guide. No examination questions, mark schemes or curriculum text were copied. CC0 applies only to original expression, organisation, metadata and generated media to the extent applicable rights exist; it does not license source publications or claim ownership of facts.

Independent, unofficial study material by Open Study Contributor. No affiliation with or endorsement by CEPT/ECC, IMO, ITU, Inmarsat, Iridium or any certification authority is claimed. See the official CEPT syllabus and implementation information; national requirements must be checked with the relevant administration.

Карти в това тесте

  1. Карта 1

    Въпрос

    In maritime radio, what does GMDSS stand for?

    Отговор

    Global Maritime Distress and Safety System.

  2. Карта 2

    Въпрос

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

    Отговор

    General Operator’s Certificate.

  3. Карта 3

    Въпрос

    What does a radio frequency of 1 Hz represent?

    Отговор

    One cycle per second.

  4. Карта 4

    Въпрос

    In GMDSS, what does MSI stand for?

    Отговор

    Maritime Safety Information.

  5. Карта 5

    Въпрос

    Which international organisation develops the maritime safety framework behind GMDSS?

    Отговор

    The International Maritime Organization (IMO).

  6. Карта 6

    Въпрос

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

    Отговор

    The International Telecommunication Union (ITU).

  7. Карта 7

    Въпрос

    GMDSS combines which two broad communication paths?

    Отговор

    Terrestrial radio and satellite communication.

  8. Карта 8

    Въпрос

    In maritime radio, what does DSC stand for?

    Отговор

    Digital Selective Calling.

  9. Карта 9

    Въпрос

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

    Отговор

    Distress.

  10. Карта 10

    Въпрос

    What is the purpose of NAVTEX?

    Отговор

    Automatic reception of broadcast maritime safety information as text.

  11. Карта 11

    Въпрос

    In maritime radio, what does MMSI stand for?

    Отговор

    Maritime Mobile Service Identity.

  12. Карта 12

    Въпрос

    In maritime satellite communications, what does SES stand for?

    Отговор

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

  13. Карта 13

    Въпрос

    In maritime safety, what does EPIRB stand for?

    Отговор

    Emergency Position-Indicating Radio Beacon.

  14. Карта 14

    Въпрос

    How many hertz are in 1 kHz?

    Отговор

    1000 Hz.

  15. Карта 15

    Въпрос

    In maritime communications, what does SAR stand for?

    Отговор

    Search and Rescue.

  16. Карта 16

    Въпрос

    What is the basic role of maritime DSC?

    Отговор

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

  17. Карта 17

    Въпрос

    In radio spectrum terminology, what does MF mean?

    Отговор

    Medium frequency: 300 kHz to 3 MHz.

  18. Карта 18

    Въпрос

    What is the international NAVTEX frequency?

    Отговор

    518 kHz.

  19. Карта 19

    Въпрос

    How many digits does an MMSI contain?

    Отговор

    Nine digits.

  20. Карта 20

    Въпрос

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

    Отговор

    Urgency.

  21. Карта 21

    Въпрос

    In radio spectrum terminology, what does HF mean?

    Отговор

    High frequency: 3 to 30 MHz.

  22. Карта 22

    Въпрос

    In GMDSS, what does RMSS mean?

    Отговор

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

  23. Карта 23

    Въпрос

    How many kilohertz are in 1 MHz?

    Отговор

    1000 kHz.

  24. Карта 24

    Въпрос

    In a NAVTEX header, what does B1 identify?

    Отговор

    The transmitter.

  25. Карта 25

    Въпрос

    In radio spectrum terminology, what does VHF mean?

    Отговор

    Very high frequency: 30 to 300 MHz.

  26. Карта 26

    Въпрос

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

    Отговор

    Safety.

  27. Карта 27

    Въпрос

    Which radio coverage defines GMDSS sea area A1?

    Отговор

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

  28. Карта 28

    Въпрос

    What do the Maritime Identification Digits in an MMSI identify?

    Отговор

    The administration with jurisdiction over the station.

  29. Карта 29

    Въпрос

    In a NAVTEX header, what does B2 identify?

    Отговор

    The message subject category.

  30. Карта 30

    Въпрос

    Which spoken maritime radio signal denotes distress?

    Отговор

    MAYDAY.

  31. Карта 31

    Въпрос

    Which radio coverage defines GMDSS sea area A2?

    Отговор

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

  32. Карта 32

    Въпрос

    What atmospheric region enables HF skywave communication beyond the horizon?

    Отговор

    The ionosphere.

  33. Карта 33

    Въпрос

    What do the B3B4 characters in a NAVTEX header represent?

    Отговор

    The two-digit message number.

  34. Карта 34

    Въпрос

    Which spoken maritime radio signal denotes urgency?

    Отговор

    PAN PAN.

  35. Карта 35

    Въпрос

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

    Отговор

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

  36. Карта 36

    Въпрос

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

    Отговор

    English.

  37. Карта 37

    Въпрос

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

    Отговор

    Alternately: one direction transmits at a time.

  38. Карта 38

    Въпрос

    Which spoken maritime radio signal introduces safety traffic?

    Отговор

    SÉCURITÉ (SECURITE).

  39. Карта 39

    Въпрос

    How is GMDSS sea area A4 defined?

    Отговор

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

  40. Карта 40

    Въпрос

    Which NAVTEX subject category does B2 = A represent?

    Отговор

    Navigational warnings.

  41. Карта 41

    Въпрос

    In ITU radio terminology, what does duplex operation permit?

    Отговор

    Simultaneous transmission in both directions.

  42. Карта 42

    Въпрос

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

    Отговор

    Distress → urgency → safety → routine.

  43. Карта 43

    Въпрос

    Which marine VHF channel is reserved for DSC?

    Отговор

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

  44. Карта 44

    Въпрос

    Which NAVTEX subject category does B2 = B represent?

    Отговор

    Meteorological warnings.

  45. Карта 45

    Въпрос

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

    Отговор

    406 MHz.

  46. Карта 46

    Въпрос

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

    Отговор

    Safety radio communications between ships from their navigating positions.

  47. Карта 47

    Въпрос

    Which marine VHF channel carries radiotelephony distress and safety traffic?

    Отговор

    Channel 16, 156.8 MHz.

  48. Карта 48

    Въпрос

    Which NAVTEX subject category does B2 = E represent?

    Отговор

    Meteorological forecasts.

  49. Карта 49

    Въпрос

    What does integrated GNSS add to an EPIRB distress alert?

    Отговор

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

  50. Карта 50

    Въпрос

    Which GMDSS communication function concerns units at the incident location?

    Отговор

    On-scene communications.

  51. Карта 51

    Въпрос

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

    Отговор

    2187.5 kHz.

  52. Карта 52

    Въпрос

    Which NAVTEX subject category does B2 = C represent?

    Отговор

    Ice reports.

  53. Карта 53

    Въпрос

    Why does accurate EPIRB registration help rescue authorities?

    Отговор

    It links the beacon identity to vessel and contact information.

  54. Карта 54

    Въпрос

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

    Отговор

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

  55. Карта 55

    Въпрос

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

    Отговор

    2182 kHz.

  56. Карта 56

    Въпрос

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

    Отговор

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

  57. Карта 57

    Въпрос

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

    Отговор

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

  58. Карта 58

    Въпрос

    Does the CEPT GOC syllabus assess theory alone?

    Отговор

    No. It requires theoretical and practical tests.

  59. Карта 59

    Въпрос

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

    Отговор

    Wavelength becomes shorter.

  60. Карта 60

    Въпрос

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

    Отговор

    Enhanced Group Call.

  61. Карта 61

    Въпрос

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

    Отговор

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

  62. Карта 62

    Въпрос

    Why does GMDSS communication planning consider the whole voyage?

    Отговор

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

  63. Карта 63

    Въпрос

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

    Отговор

    MIDXXXXXX: three Maritime Identification Digits followed by six digits.

  64. Карта 64

    Въпрос

    Which named Inmarsat service broadcasts maritime safety information?

    Отговор

    SafetyNET.

  65. Карта 65

    Въпрос

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

    Отговор

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

  66. Карта 66

    Въпрос

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

    Отговор

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

  67. Карта 67

    Въпрос

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

    Отговор

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

  68. Карта 68

    Въпрос

    Which named Iridium service broadcasts maritime safety information?

    Отговор

    SafetyCast.

  69. Карта 69

    Въпрос

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

    Отговор

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

  70. Карта 70

    Въпрос

    What is a NAVAREA used to coordinate?

    Отговор

    Navigational warnings for a defined sea area.

  71. Карта 71

    Въпрос

    What is the primary role of a radar SART?

    Отговор

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

  72. Карта 72

    Въпрос

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

    Отговор

    Channel 70 is for DSC, not radiotelephony.

  73. Карта 73

    Въпрос

    What is a METAREA used to coordinate?

    Отговор

    Marine meteorological warnings and forecasts for a defined sea area.

  74. Карта 74

    Въпрос

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

    Отговор

    Volume III, Mobile Facilities.

  75. Карта 75

    Въпрос

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

    Отговор

    Changes in the ionosphere can degrade or disrupt HF propagation.

  76. Карта 76

    Въпрос

    Which radar band does a GMDSS radar SART use?

    Отговор

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

  77. Карта 77

    Въпрос

    Why is preventing false distress alerts a safety issue?

    Отговор

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

  78. Карта 78

    Въпрос

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

    Отговор

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

  79. Карта 79

    Въпрос

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

    Отговор

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

  80. Карта 80

    Въпрос

    How does an AIS-SART provide a locating signal?

    Отговор

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

Original illustration of a maritime radio and handset on a ship’s bridge, with a vessel at sea beyond the window.

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GMDSS GOC Flashcards: Radio Concepts and Terminology

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