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.
A pakliról
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.
Kártyák ebben a pakliban
1. kártya
Kérdés
In maritime radio, what does GMDSS stand for?
Válasz
Global Maritime Distress and Safety System.
2. kártya
Kérdés
In the CEPT maritime-radio syllabus, what does GOC stand for?
Válasz
General Operator’s Certificate.
3. kártya
Kérdés
What does a radio frequency of 1 Hz represent?
Válasz
One cycle per second.
4. kártya
Kérdés
In GMDSS, what does MSI stand for?
Válasz
Maritime Safety Information.
5. kártya
Kérdés
Which international organisation develops the maritime safety framework behind GMDSS?
Válasz
The International Maritime Organization (IMO).
6. kártya
Kérdés
Which international organisation maintains the Radio Regulations used by maritime radio services?
Válasz
The International Telecommunication Union (ITU).
7. kártya
Kérdés
GMDSS combines which two broad communication paths?
Válasz
Terrestrial radio and satellite communication.
8. kártya
Kérdés
In maritime radio, what does DSC stand for?
Válasz
Digital Selective Calling.
9. kártya
Kérdés
Which maritime emergency category means grave and imminent danger requiring immediate assistance?
Válasz
Distress.
10. kártya
Kérdés
What is the purpose of NAVTEX?
Válasz
Automatic reception of broadcast maritime safety information as text.
11. kártya
Kérdés
In maritime radio, what does MMSI stand for?
Válasz
Maritime Mobile Service Identity.
12. kártya
Kérdés
In maritime satellite communications, what does SES stand for?
Válasz
Ship Earth Station: the satellite-communication station aboard a ship.
13. kártya
Kérdés
In maritime safety, what does EPIRB stand for?
Válasz
Emergency Position-Indicating Radio Beacon.
14. kártya
Kérdés
How many hertz are in 1 kHz?
Válasz
1000 Hz.
15. kártya
Kérdés
In maritime communications, what does SAR stand for?
Válasz
Search and Rescue.
16. kártya
Kérdés
What is the basic role of maritime DSC?
Válasz
Establishing contact and transferring calling or alert information using digital codes.
17. kártya
Kérdés
In radio spectrum terminology, what does MF mean?
Válasz
Medium frequency: 300 kHz to 3 MHz.
18. kártya
Kérdés
What is the international NAVTEX frequency?
Válasz
518 kHz.
19. kártya
Kérdés
How many digits does an MMSI contain?
Válasz
Nine digits.
20. kártya
Kérdés
Which category concerns an urgent safety message without the distress condition requiring immediate assistance?
Válasz
Urgency.
21. kártya
Kérdés
In radio spectrum terminology, what does HF mean?
Válasz
High frequency: 3 to 30 MHz.
22. kártya
Kérdés
In GMDSS, what does RMSS mean?
Válasz
Recognised Mobile Satellite Service: a satellite service recognised by IMO for GMDSS.
23. kártya
Kérdés
How many kilohertz are in 1 MHz?
Válasz
1000 kHz.
24. kártya
Kérdés
In a NAVTEX header, what does B1 identify?
Válasz
The transmitter.
25. kártya
Kérdés
In radio spectrum terminology, what does VHF mean?
Válasz
Very high frequency: 30 to 300 MHz.
26. kártya
Kérdés
Which category announces navigation-safety information or important meteorological warnings?
Válasz
Safety.
27. kártya
Kérdés
Which radio coverage defines GMDSS sea area A1?
Válasz
VHF coast-station voice coverage with continuous DSC alerting, as defined by a Contracting Government.
28. kártya
Kérdés
What do the Maritime Identification Digits in an MMSI identify?
Válasz
The administration with jurisdiction over the station.
29. kártya
Kérdés
In a NAVTEX header, what does B2 identify?
Válasz
The message subject category.
30. kártya
Kérdés
Which spoken maritime radio signal denotes distress?
Válasz
MAYDAY.
31. kártya
Kérdés
Which radio coverage defines GMDSS sea area A2?
Válasz
MF coast-station voice coverage with continuous DSC alerting, outside A1, as defined by a Contracting Government.
32. kártya
Kérdés
What atmospheric region enables HF skywave communication beyond the horizon?
Válasz
The ionosphere.
33. kártya
Kérdés
What do the B3B4 characters in a NAVTEX header represent?
Válasz
The two-digit message number.
34. kártya
Kérdés
Which spoken maritime radio signal denotes urgency?
Válasz
PAN PAN.
35. kártya
Kérdés
Since 1 January 2024, what determines a ship’s GMDSS sea area A3?
Válasz
Its carried ship earth station’s recognised mobile satellite service coverage with continuous alerting, outside A1 and A2.
36. kártya
Kérdés
Which language is used by the international NAVTEX service on 518 kHz?
Válasz
English.
37. kártya
Kérdés
In ITU radio terminology, how do the two directions operate in simplex communication?
Válasz
Alternately: one direction transmits at a time.
38. kártya
Kérdés
Which spoken maritime radio signal introduces safety traffic?
Válasz
SÉCURITÉ (SECURITE).
39. kártya
Kérdés
How is GMDSS sea area A4 defined?
Válasz
The area outside A1, A2 and that ship’s A3.
40. kártya
Kérdés
Which NAVTEX subject category does B2 = A represent?
Válasz
Navigational warnings.
41. kártya
Kérdés
In ITU radio terminology, what does duplex operation permit?
Válasz
Simultaneous transmission in both directions.
42. kártya
Kérdés
What is the priority order of distress, urgency, safety and routine radio traffic?
Válasz
Distress → urgency → safety → routine.
43. kártya
Kérdés
Which marine VHF channel is reserved for DSC?
Válasz
Channel 70, 156.525 MHz; it is not a voice channel.
44. kártya
Kérdés
Which NAVTEX subject category does B2 = B represent?
Válasz
Meteorological warnings.
45. kártya
Kérdés
Which frequency band identifies the satellite distress-alerting function of a modern EPIRB?
Válasz
406 MHz.
46. kártya
Kérdés
What are bridge-to-bridge communications in GMDSS terminology?
Válasz
Safety radio communications between ships from their navigating positions.
47. kártya
Kérdés
Which marine VHF channel carries radiotelephony distress and safety traffic?
Válasz
Channel 16, 156.8 MHz.
48. kártya
Kérdés
Which NAVTEX subject category does B2 = E represent?
Válasz
Meteorological forecasts.
49. kártya
Kérdés
What does integrated GNSS add to an EPIRB distress alert?
Válasz
An encoded position from a Global Navigation Satellite System, helping rescuers locate the beacon.
50. kártya
Kérdés
Which GMDSS communication function concerns units at the incident location?
Válasz
On-scene communications.
51. kártya
Kérdés
Which MF frequency is used for DSC distress and safety calling?
Válasz
2187.5 kHz.
52. kártya
Kérdés
Which NAVTEX subject category does B2 = C represent?
Válasz
Ice reports.
53. kártya
Kérdés
Why does accurate EPIRB registration help rescue authorities?
Válasz
It links the beacon identity to vessel and contact information.
54. kártya
Kérdés
What is the purpose of a GMDSS reserve source of energy?
Válasz
Powering distress and safety radio equipment if main and emergency electrical supplies fail.
55. kártya
Kérdés
Which MF frequency is used for radiotelephony distress and safety communications?
Válasz
2182 kHz.
56. kártya
Kérdés
Name the lower-frequency national NAVTEX channel distinct from international 518 kHz.
Válasz
490 kHz; availability and language depend on the national service.
57. kártya
Kérdés
What is the role of an EPIRB’s low-power 121.5 MHz signal?
Válasz
Local homing by rescue units; Cospas-Sarsat satellites no longer process 121.5 MHz alerts.
58. kártya
Kérdés
Does the CEPT GOC syllabus assess theory alone?
Válasz
No. It requires theoretical and practical tests.
59. kártya
Kérdés
At the same wave speed, what happens to wavelength when frequency rises?
Válasz
Wavelength becomes shorter.
60. kártya
Kérdés
In maritime satellite safety broadcasts, what does EGC stand for?
Válasz
Enhanced Group Call.
61. kártya
Kérdés
What is the purpose of a float-free EPIRB’s hydrostatic release?
Válasz
Releasing the beacon from its bracket when submerged, so it can float free.
62. kártya
Kérdés
Why does GMDSS communication planning consider the whole voyage?
Válasz
Service coverage, relevant stations and safety-information areas can change along the route.
63. kártya
Kérdés
What is the standard ship-station MMSI pattern, using MID and X placeholders?
Válasz
MIDXXXXXX: three Maritime Identification Digits followed by six digits.
64. kártya
Kérdés
Which named Inmarsat service broadcasts maritime safety information?
Válasz
SafetyNET.
65. kártya
Kérdés
Does a beacon Return Link Service (RLS) indication mean a rescue has been launched?
Válasz
No. It confirms receipt, localisation and forwarding of the alert, not launch of a rescue.
66. kártya
Kérdés
Two ships share a position outside A1/A2 but carry different RMSS terminals. Must their A3 coverage match?
Válasz
No. A3 depends on the RMSS supported by each ship’s carried earth station.
67. kártya
Kérdés
What is the coast-station MMSI pattern, using MID and X placeholders?
Válasz
00MIDXXXX: two leading zeros, the MID, then four digits.
68. kártya
Kérdés
Which named Iridium service broadcasts maritime safety information?
Válasz
SafetyCast.
69. kártya
Kérdés
Why use an EPIRB’s approved self-test instead of ordinary activation for practice?
Válasz
Ordinary activation can transmit a real distress alert and divert rescue resources.
70. kártya
Kérdés
What is a NAVAREA used to coordinate?
Válasz
Navigational warnings for a defined sea area.
71. kártya
Kérdés
What is the primary role of a radar SART?
Válasz
Helping nearby rescue units locate survivors through a radar response. SART means Search and Rescue Transponder.
72. kártya
Kérdés
A training question asks for voice transmission on VHF channel 70. What is the conceptual error?
Válasz
Channel 70 is for DSC, not radiotelephony.
73. kártya
Kérdés
What is a METAREA used to coordinate?
Válasz
Marine meteorological warnings and forecasts for a defined sea area.
74. kártya
Kérdés
Which IAMSAR volume is intended for vessels and other mobile facilities?
Válasz
Volume III, Mobile Facilities.
75. kártya
Kérdés
Why can an HF link become unreliable during disturbed space weather?
Válasz
Changes in the ionosphere can degrade or disrupt HF propagation.
76. kártya
Kérdés
Which radar band does a GMDSS radar SART use?
Válasz
9.2–9.5 GHz, in the 9 GHz/X-band radar region.
77. kártya
Kérdés
Why is preventing false distress alerts a safety issue?
Válasz
False alerts can divert search-and-rescue resources from real emergencies.
78. kártya
Kérdés
Does receiving a NAVTEX transmitter’s signal prove that every received warning concerns the ship’s position?
Válasz
No. Radio coverage and the transmitter’s defined service area are different concepts.
79. kártya
Kérdés
A training display says an RLS alert was received. What rescue outcome must not be inferred?
Válasz
That rescue units have already been dispatched or will arrive at a particular time.
80. kártya
Kérdés
How does an AIS-SART provide a locating signal?
Válasz
By transmitting search-and-rescue locating information on Automatic Identification System (AIS) frequencies.
80 kártya
GMDSS GOC Flashcards: Radio Concepts and Terminology
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