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