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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.

Autor Open Study Contributor

O tej talii

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.

Karty w tej talii

  1. Karta 1

    Pytanie

    In maritime radio, what does GMDSS stand for?

    Odpowiedź

    Global Maritime Distress and Safety System.

  2. Karta 2

    Pytanie

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

    Odpowiedź

    General Operator’s Certificate.

  3. Karta 3

    Pytanie

    What does a radio frequency of 1 Hz represent?

    Odpowiedź

    One cycle per second.

  4. Karta 4

    Pytanie

    In GMDSS, what does MSI stand for?

    Odpowiedź

    Maritime Safety Information.

  5. Karta 5

    Pytanie

    Which international organisation develops the maritime safety framework behind GMDSS?

    Odpowiedź

    The International Maritime Organization (IMO).

  6. Karta 6

    Pytanie

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

    Odpowiedź

    The International Telecommunication Union (ITU).

  7. Karta 7

    Pytanie

    GMDSS combines which two broad communication paths?

    Odpowiedź

    Terrestrial radio and satellite communication.

  8. Karta 8

    Pytanie

    In maritime radio, what does DSC stand for?

    Odpowiedź

    Digital Selective Calling.

  9. Karta 9

    Pytanie

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

    Odpowiedź

    Distress.

  10. Karta 10

    Pytanie

    What is the purpose of NAVTEX?

    Odpowiedź

    Automatic reception of broadcast maritime safety information as text.

  11. Karta 11

    Pytanie

    In maritime radio, what does MMSI stand for?

    Odpowiedź

    Maritime Mobile Service Identity.

  12. Karta 12

    Pytanie

    In maritime satellite communications, what does SES stand for?

    Odpowiedź

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

  13. Karta 13

    Pytanie

    In maritime safety, what does EPIRB stand for?

    Odpowiedź

    Emergency Position-Indicating Radio Beacon.

  14. Karta 14

    Pytanie

    How many hertz are in 1 kHz?

    Odpowiedź

    1000 Hz.

  15. Karta 15

    Pytanie

    In maritime communications, what does SAR stand for?

    Odpowiedź

    Search and Rescue.

  16. Karta 16

    Pytanie

    What is the basic role of maritime DSC?

    Odpowiedź

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

  17. Karta 17

    Pytanie

    In radio spectrum terminology, what does MF mean?

    Odpowiedź

    Medium frequency: 300 kHz to 3 MHz.

  18. Karta 18

    Pytanie

    What is the international NAVTEX frequency?

    Odpowiedź

    518 kHz.

  19. Karta 19

    Pytanie

    How many digits does an MMSI contain?

    Odpowiedź

    Nine digits.

  20. Karta 20

    Pytanie

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

    Odpowiedź

    Urgency.

  21. Karta 21

    Pytanie

    In radio spectrum terminology, what does HF mean?

    Odpowiedź

    High frequency: 3 to 30 MHz.

  22. Karta 22

    Pytanie

    In GMDSS, what does RMSS mean?

    Odpowiedź

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

  23. Karta 23

    Pytanie

    How many kilohertz are in 1 MHz?

    Odpowiedź

    1000 kHz.

  24. Karta 24

    Pytanie

    In a NAVTEX header, what does B1 identify?

    Odpowiedź

    The transmitter.

  25. Karta 25

    Pytanie

    In radio spectrum terminology, what does VHF mean?

    Odpowiedź

    Very high frequency: 30 to 300 MHz.

  26. Karta 26

    Pytanie

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

    Odpowiedź

    Safety.

  27. Karta 27

    Pytanie

    Which radio coverage defines GMDSS sea area A1?

    Odpowiedź

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

  28. Karta 28

    Pytanie

    What do the Maritime Identification Digits in an MMSI identify?

    Odpowiedź

    The administration with jurisdiction over the station.

  29. Karta 29

    Pytanie

    In a NAVTEX header, what does B2 identify?

    Odpowiedź

    The message subject category.

  30. Karta 30

    Pytanie

    Which spoken maritime radio signal denotes distress?

    Odpowiedź

    MAYDAY.

  31. Karta 31

    Pytanie

    Which radio coverage defines GMDSS sea area A2?

    Odpowiedź

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

  32. Karta 32

    Pytanie

    What atmospheric region enables HF skywave communication beyond the horizon?

    Odpowiedź

    The ionosphere.

  33. Karta 33

    Pytanie

    What do the B3B4 characters in a NAVTEX header represent?

    Odpowiedź

    The two-digit message number.

  34. Karta 34

    Pytanie

    Which spoken maritime radio signal denotes urgency?

    Odpowiedź

    PAN PAN.

  35. Karta 35

    Pytanie

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

    Odpowiedź

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

  36. Karta 36

    Pytanie

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

    Odpowiedź

    English.

  37. Karta 37

    Pytanie

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

    Odpowiedź

    Alternately: one direction transmits at a time.

  38. Karta 38

    Pytanie

    Which spoken maritime radio signal introduces safety traffic?

    Odpowiedź

    SÉCURITÉ (SECURITE).

  39. Karta 39

    Pytanie

    How is GMDSS sea area A4 defined?

    Odpowiedź

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

  40. Karta 40

    Pytanie

    Which NAVTEX subject category does B2 = A represent?

    Odpowiedź

    Navigational warnings.

  41. Karta 41

    Pytanie

    In ITU radio terminology, what does duplex operation permit?

    Odpowiedź

    Simultaneous transmission in both directions.

  42. Karta 42

    Pytanie

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

    Odpowiedź

    Distress → urgency → safety → routine.

  43. Karta 43

    Pytanie

    Which marine VHF channel is reserved for DSC?

    Odpowiedź

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

  44. Karta 44

    Pytanie

    Which NAVTEX subject category does B2 = B represent?

    Odpowiedź

    Meteorological warnings.

  45. Karta 45

    Pytanie

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

    Odpowiedź

    406 MHz.

  46. Karta 46

    Pytanie

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

    Odpowiedź

    Safety radio communications between ships from their navigating positions.

  47. Karta 47

    Pytanie

    Which marine VHF channel carries radiotelephony distress and safety traffic?

    Odpowiedź

    Channel 16, 156.8 MHz.

  48. Karta 48

    Pytanie

    Which NAVTEX subject category does B2 = E represent?

    Odpowiedź

    Meteorological forecasts.

  49. Karta 49

    Pytanie

    What does integrated GNSS add to an EPIRB distress alert?

    Odpowiedź

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

  50. Karta 50

    Pytanie

    Which GMDSS communication function concerns units at the incident location?

    Odpowiedź

    On-scene communications.

  51. Karta 51

    Pytanie

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

    Odpowiedź

    2187.5 kHz.

  52. Karta 52

    Pytanie

    Which NAVTEX subject category does B2 = C represent?

    Odpowiedź

    Ice reports.

  53. Karta 53

    Pytanie

    Why does accurate EPIRB registration help rescue authorities?

    Odpowiedź

    It links the beacon identity to vessel and contact information.

  54. Karta 54

    Pytanie

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

    Odpowiedź

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

  55. Karta 55

    Pytanie

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

    Odpowiedź

    2182 kHz.

  56. Karta 56

    Pytanie

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

    Odpowiedź

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

  57. Karta 57

    Pytanie

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

    Odpowiedź

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

  58. Karta 58

    Pytanie

    Does the CEPT GOC syllabus assess theory alone?

    Odpowiedź

    No. It requires theoretical and practical tests.

  59. Karta 59

    Pytanie

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

    Odpowiedź

    Wavelength becomes shorter.

  60. Karta 60

    Pytanie

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

    Odpowiedź

    Enhanced Group Call.

  61. Karta 61

    Pytanie

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

    Odpowiedź

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

  62. Karta 62

    Pytanie

    Why does GMDSS communication planning consider the whole voyage?

    Odpowiedź

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

  63. Karta 63

    Pytanie

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

    Odpowiedź

    MIDXXXXXX: three Maritime Identification Digits followed by six digits.

  64. Karta 64

    Pytanie

    Which named Inmarsat service broadcasts maritime safety information?

    Odpowiedź

    SafetyNET.

  65. Karta 65

    Pytanie

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

    Odpowiedź

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

  66. Karta 66

    Pytanie

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

    Odpowiedź

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

  67. Karta 67

    Pytanie

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

    Odpowiedź

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

  68. Karta 68

    Pytanie

    Which named Iridium service broadcasts maritime safety information?

    Odpowiedź

    SafetyCast.

  69. Karta 69

    Pytanie

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

    Odpowiedź

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

  70. Karta 70

    Pytanie

    What is a NAVAREA used to coordinate?

    Odpowiedź

    Navigational warnings for a defined sea area.

  71. Karta 71

    Pytanie

    What is the primary role of a radar SART?

    Odpowiedź

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

  72. Karta 72

    Pytanie

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

    Odpowiedź

    Channel 70 is for DSC, not radiotelephony.

  73. Karta 73

    Pytanie

    What is a METAREA used to coordinate?

    Odpowiedź

    Marine meteorological warnings and forecasts for a defined sea area.

  74. Karta 74

    Pytanie

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

    Odpowiedź

    Volume III, Mobile Facilities.

  75. Karta 75

    Pytanie

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

    Odpowiedź

    Changes in the ionosphere can degrade or disrupt HF propagation.

  76. Karta 76

    Pytanie

    Which radar band does a GMDSS radar SART use?

    Odpowiedź

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

  77. Karta 77

    Pytanie

    Why is preventing false distress alerts a safety issue?

    Odpowiedź

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

  78. Karta 78

    Pytanie

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

    Odpowiedź

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

  79. Karta 79

    Pytanie

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

    Odpowiedź

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

  80. Karta 80

    Pytanie

    How does an AIS-SART provide a locating signal?

    Odpowiedź

    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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