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