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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.

Par Open Study Contributor

À propos de ce paquet

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.

Cartes de ce paquet

  1. Carte 1

    Question

    In maritime radio, what does GMDSS stand for?

    Réponse

    Global Maritime Distress and Safety System.

  2. Carte 2

    Question

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

    Réponse

    General Operator’s Certificate.

  3. Carte 3

    Question

    What does a radio frequency of 1 Hz represent?

    Réponse

    One cycle per second.

  4. Carte 4

    Question

    In GMDSS, what does MSI stand for?

    Réponse

    Maritime Safety Information.

  5. Carte 5

    Question

    Which international organisation develops the maritime safety framework behind GMDSS?

    Réponse

    The International Maritime Organization (IMO).

  6. Carte 6

    Question

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

    Réponse

    The International Telecommunication Union (ITU).

  7. Carte 7

    Question

    GMDSS combines which two broad communication paths?

    Réponse

    Terrestrial radio and satellite communication.

  8. Carte 8

    Question

    In maritime radio, what does DSC stand for?

    Réponse

    Digital Selective Calling.

  9. Carte 9

    Question

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

    Réponse

    Distress.

  10. Carte 10

    Question

    What is the purpose of NAVTEX?

    Réponse

    Automatic reception of broadcast maritime safety information as text.

  11. Carte 11

    Question

    In maritime radio, what does MMSI stand for?

    Réponse

    Maritime Mobile Service Identity.

  12. Carte 12

    Question

    In maritime satellite communications, what does SES stand for?

    Réponse

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

  13. Carte 13

    Question

    In maritime safety, what does EPIRB stand for?

    Réponse

    Emergency Position-Indicating Radio Beacon.

  14. Carte 14

    Question

    How many hertz are in 1 kHz?

    Réponse

    1000 Hz.

  15. Carte 15

    Question

    In maritime communications, what does SAR stand for?

    Réponse

    Search and Rescue.

  16. Carte 16

    Question

    What is the basic role of maritime DSC?

    Réponse

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

  17. Carte 17

    Question

    In radio spectrum terminology, what does MF mean?

    Réponse

    Medium frequency: 300 kHz to 3 MHz.

  18. Carte 18

    Question

    What is the international NAVTEX frequency?

    Réponse

    518 kHz.

  19. Carte 19

    Question

    How many digits does an MMSI contain?

    Réponse

    Nine digits.

  20. Carte 20

    Question

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

    Réponse

    Urgency.

  21. Carte 21

    Question

    In radio spectrum terminology, what does HF mean?

    Réponse

    High frequency: 3 to 30 MHz.

  22. Carte 22

    Question

    In GMDSS, what does RMSS mean?

    Réponse

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

  23. Carte 23

    Question

    How many kilohertz are in 1 MHz?

    Réponse

    1000 kHz.

  24. Carte 24

    Question

    In a NAVTEX header, what does B1 identify?

    Réponse

    The transmitter.

  25. Carte 25

    Question

    In radio spectrum terminology, what does VHF mean?

    Réponse

    Very high frequency: 30 to 300 MHz.

  26. Carte 26

    Question

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

    Réponse

    Safety.

  27. Carte 27

    Question

    Which radio coverage defines GMDSS sea area A1?

    Réponse

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

  28. Carte 28

    Question

    What do the Maritime Identification Digits in an MMSI identify?

    Réponse

    The administration with jurisdiction over the station.

  29. Carte 29

    Question

    In a NAVTEX header, what does B2 identify?

    Réponse

    The message subject category.

  30. Carte 30

    Question

    Which spoken maritime radio signal denotes distress?

    Réponse

    MAYDAY.

  31. Carte 31

    Question

    Which radio coverage defines GMDSS sea area A2?

    Réponse

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

  32. Carte 32

    Question

    What atmospheric region enables HF skywave communication beyond the horizon?

    Réponse

    The ionosphere.

  33. Carte 33

    Question

    What do the B3B4 characters in a NAVTEX header represent?

    Réponse

    The two-digit message number.

  34. Carte 34

    Question

    Which spoken maritime radio signal denotes urgency?

    Réponse

    PAN PAN.

  35. Carte 35

    Question

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

    Réponse

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

  36. Carte 36

    Question

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

    Réponse

    English.

  37. Carte 37

    Question

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

    Réponse

    Alternately: one direction transmits at a time.

  38. Carte 38

    Question

    Which spoken maritime radio signal introduces safety traffic?

    Réponse

    SÉCURITÉ (SECURITE).

  39. Carte 39

    Question

    How is GMDSS sea area A4 defined?

    Réponse

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

  40. Carte 40

    Question

    Which NAVTEX subject category does B2 = A represent?

    Réponse

    Navigational warnings.

  41. Carte 41

    Question

    In ITU radio terminology, what does duplex operation permit?

    Réponse

    Simultaneous transmission in both directions.

  42. Carte 42

    Question

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

    Réponse

    Distress → urgency → safety → routine.

  43. Carte 43

    Question

    Which marine VHF channel is reserved for DSC?

    Réponse

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

  44. Carte 44

    Question

    Which NAVTEX subject category does B2 = B represent?

    Réponse

    Meteorological warnings.

  45. Carte 45

    Question

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

    Réponse

    406 MHz.

  46. Carte 46

    Question

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

    Réponse

    Safety radio communications between ships from their navigating positions.

  47. Carte 47

    Question

    Which marine VHF channel carries radiotelephony distress and safety traffic?

    Réponse

    Channel 16, 156.8 MHz.

  48. Carte 48

    Question

    Which NAVTEX subject category does B2 = E represent?

    Réponse

    Meteorological forecasts.

  49. Carte 49

    Question

    What does integrated GNSS add to an EPIRB distress alert?

    Réponse

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

  50. Carte 50

    Question

    Which GMDSS communication function concerns units at the incident location?

    Réponse

    On-scene communications.

  51. Carte 51

    Question

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

    Réponse

    2187.5 kHz.

  52. Carte 52

    Question

    Which NAVTEX subject category does B2 = C represent?

    Réponse

    Ice reports.

  53. Carte 53

    Question

    Why does accurate EPIRB registration help rescue authorities?

    Réponse

    It links the beacon identity to vessel and contact information.

  54. Carte 54

    Question

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

    Réponse

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

  55. Carte 55

    Question

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

    Réponse

    2182 kHz.

  56. Carte 56

    Question

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

    Réponse

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

  57. Carte 57

    Question

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

    Réponse

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

  58. Carte 58

    Question

    Does the CEPT GOC syllabus assess theory alone?

    Réponse

    No. It requires theoretical and practical tests.

  59. Carte 59

    Question

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

    Réponse

    Wavelength becomes shorter.

  60. Carte 60

    Question

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

    Réponse

    Enhanced Group Call.

  61. Carte 61

    Question

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

    Réponse

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

  62. Carte 62

    Question

    Why does GMDSS communication planning consider the whole voyage?

    Réponse

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

  63. Carte 63

    Question

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

    Réponse

    MIDXXXXXX: three Maritime Identification Digits followed by six digits.

  64. Carte 64

    Question

    Which named Inmarsat service broadcasts maritime safety information?

    Réponse

    SafetyNET.

  65. Carte 65

    Question

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

    Réponse

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

  66. Carte 66

    Question

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

    Réponse

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

  67. Carte 67

    Question

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

    Réponse

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

  68. Carte 68

    Question

    Which named Iridium service broadcasts maritime safety information?

    Réponse

    SafetyCast.

  69. Carte 69

    Question

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

    Réponse

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

  70. Carte 70

    Question

    What is a NAVAREA used to coordinate?

    Réponse

    Navigational warnings for a defined sea area.

  71. Carte 71

    Question

    What is the primary role of a radar SART?

    Réponse

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

  72. Carte 72

    Question

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

    Réponse

    Channel 70 is for DSC, not radiotelephony.

  73. Carte 73

    Question

    What is a METAREA used to coordinate?

    Réponse

    Marine meteorological warnings and forecasts for a defined sea area.

  74. Carte 74

    Question

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

    Réponse

    Volume III, Mobile Facilities.

  75. Carte 75

    Question

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

    Réponse

    Changes in the ionosphere can degrade or disrupt HF propagation.

  76. Carte 76

    Question

    Which radar band does a GMDSS radar SART use?

    Réponse

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

  77. Carte 77

    Question

    Why is preventing false distress alerts a safety issue?

    Réponse

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

  78. Carte 78

    Question

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

    Réponse

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

  79. Carte 79

    Question

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

    Réponse

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

  80. Carte 80

    Question

    How does an AIS-SART provide a locating signal?

    Réponse

    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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