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