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