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