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