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