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