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