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