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