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.
دربارهٔ این دسته
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.
کارت‌های این دسته
کارت ۱
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In maritime radio, what does GMDSS stand for?
پاسخ
Global Maritime Distress and Safety System.
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In the CEPT maritime-radio syllabus, what does GOC stand for?
پاسخ
General Operator’s Certificate.
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What does a radio frequency of 1 Hz represent?
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One cycle per second.
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In GMDSS, what does MSI stand for?
پاسخ
Maritime Safety Information.
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Which international organisation develops the maritime safety framework behind GMDSS?
پاسخ
The International Maritime Organization (IMO).
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Which international organisation maintains the Radio Regulations used by maritime radio services?
پاسخ
The International Telecommunication Union (ITU).
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GMDSS combines which two broad communication paths?
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Terrestrial radio and satellite communication.
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In maritime radio, what does DSC stand for?
پاسخ
Digital Selective Calling.
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Which maritime emergency category means grave and imminent danger requiring immediate assistance?
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Distress.
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What is the purpose of NAVTEX?
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Automatic reception of broadcast maritime safety information as text.
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In maritime radio, what does MMSI stand for?
پاسخ
Maritime Mobile Service Identity.
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In maritime satellite communications, what does SES stand for?
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Ship Earth Station: the satellite-communication station aboard a ship.
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In maritime safety, what does EPIRB stand for?
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Emergency Position-Indicating Radio Beacon.
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How many hertz are in 1 kHz?
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1000 Hz.
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In maritime communications, what does SAR stand for?
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Search and Rescue.
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What is the basic role of maritime DSC?
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Establishing contact and transferring calling or alert information using digital codes.
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In radio spectrum terminology, what does MF mean?
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Medium frequency: 300 kHz to 3 MHz.
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What is the international NAVTEX frequency?
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518 kHz.
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How many digits does an MMSI contain?
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Nine digits.
کارت ۲۰
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Which category concerns an urgent safety message without the distress condition requiring immediate assistance?
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Urgency.
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In radio spectrum terminology, what does HF mean?
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High frequency: 3 to 30 MHz.
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In GMDSS, what does RMSS mean?
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Recognised Mobile Satellite Service: a satellite service recognised by IMO for GMDSS.
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How many kilohertz are in 1 MHz?
پاسخ
1000 kHz.
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In a NAVTEX header, what does B1 identify?
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The transmitter.
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In radio spectrum terminology, what does VHF mean?
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Very high frequency: 30 to 300 MHz.
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Which category announces navigation-safety information or important meteorological warnings?
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Safety.
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Which radio coverage defines GMDSS sea area A1?
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VHF coast-station voice coverage with continuous DSC alerting, as defined by a Contracting Government.
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What do the Maritime Identification Digits in an MMSI identify?
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The administration with jurisdiction over the station.
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In a NAVTEX header, what does B2 identify?
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The message subject category.
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Which spoken maritime radio signal denotes distress?
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MAYDAY.
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Which radio coverage defines GMDSS sea area A2?
پاسخ
MF coast-station voice coverage with continuous DSC alerting, outside A1, as defined by a Contracting Government.
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What atmospheric region enables HF skywave communication beyond the horizon?
پاسخ
The ionosphere.
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What do the B3B4 characters in a NAVTEX header represent?
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The two-digit message number.
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Which spoken maritime radio signal denotes urgency?
پاسخ
PAN PAN.
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Since 1 January 2024, what determines a ship’s GMDSS sea area A3?
پاسخ
Its carried ship earth station’s recognised mobile satellite service coverage with continuous alerting, outside A1 and A2.
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Which language is used by the international NAVTEX service on 518 kHz?
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English.
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In ITU radio terminology, how do the two directions operate in simplex communication?
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Alternately: one direction transmits at a time.
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Which spoken maritime radio signal introduces safety traffic?
پاسخ
SÉCURITÉ (SECURITE).
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How is GMDSS sea area A4 defined?
پاسخ
The area outside A1, A2 and that ship’s A3.
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Which NAVTEX subject category does B2 = A represent?
پاسخ
Navigational warnings.
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In ITU radio terminology, what does duplex operation permit?
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Simultaneous transmission in both directions.
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What is the priority order of distress, urgency, safety and routine radio traffic?
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Distress → urgency → safety → routine.
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Which marine VHF channel is reserved for DSC?
پاسخ
Channel 70, 156.525 MHz; it is not a voice channel.
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Which NAVTEX subject category does B2 = B represent?
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Meteorological warnings.
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Which frequency band identifies the satellite distress-alerting function of a modern EPIRB?
پاسخ
406 MHz.
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What are bridge-to-bridge communications in GMDSS terminology?
پاسخ
Safety radio communications between ships from their navigating positions.
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Which marine VHF channel carries radiotelephony distress and safety traffic?
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Channel 16, 156.8 MHz.
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Which NAVTEX subject category does B2 = E represent?
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Meteorological forecasts.
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What does integrated GNSS add to an EPIRB distress alert?
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An encoded position from a Global Navigation Satellite System, helping rescuers locate the beacon.
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Which GMDSS communication function concerns units at the incident location?
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On-scene communications.
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Which MF frequency is used for DSC distress and safety calling?
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2187.5 kHz.
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Which NAVTEX subject category does B2 = C represent?
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Ice reports.
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Why does accurate EPIRB registration help rescue authorities?
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It links the beacon identity to vessel and contact information.
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What is the purpose of a GMDSS reserve source of energy?
پاسخ
Powering distress and safety radio equipment if main and emergency electrical supplies fail.
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Which MF frequency is used for radiotelephony distress and safety communications?
پاسخ
2182 kHz.
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Name the lower-frequency national NAVTEX channel distinct from international 518 kHz.
پاسخ
490 kHz; availability and language depend on the national service.
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What is the role of an EPIRB’s low-power 121.5 MHz signal?
پاسخ
Local homing by rescue units; Cospas-Sarsat satellites no longer process 121.5 MHz alerts.
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Does the CEPT GOC syllabus assess theory alone?
پاسخ
No. It requires theoretical and practical tests.
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At the same wave speed, what happens to wavelength when frequency rises?
پاسخ
Wavelength becomes shorter.
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In maritime satellite safety broadcasts, what does EGC stand for?
پاسخ
Enhanced Group Call.
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What is the purpose of a float-free EPIRB’s hydrostatic release?
پاسخ
Releasing the beacon from its bracket when submerged, so it can float free.
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Why does GMDSS communication planning consider the whole voyage?
پاسخ
Service coverage, relevant stations and safety-information areas can change along the route.
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What is the standard ship-station MMSI pattern, using MID and X placeholders?
پاسخ
MIDXXXXXX: three Maritime Identification Digits followed by six digits.
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Which named Inmarsat service broadcasts maritime safety information?
پاسخ
SafetyNET.
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Does a beacon Return Link Service (RLS) indication mean a rescue has been launched?
پاسخ
No. It confirms receipt, localisation and forwarding of the alert, not launch of a rescue.
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Two ships share a position outside A1/A2 but carry different RMSS terminals. Must their A3 coverage match?
پاسخ
No. A3 depends on the RMSS supported by each ship’s carried earth station.
کارت ۶۷
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What is the coast-station MMSI pattern, using MID and X placeholders?
پاسخ
00MIDXXXX: two leading zeros, the MID, then four digits.
کارت ۶۸
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Which named Iridium service broadcasts maritime safety information?
پاسخ
SafetyCast.
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Why use an EPIRB’s approved self-test instead of ordinary activation for practice?
پاسخ
Ordinary activation can transmit a real distress alert and divert rescue resources.
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What is a NAVAREA used to coordinate?
پاسخ
Navigational warnings for a defined sea area.
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What is the primary role of a radar SART?
پاسخ
Helping nearby rescue units locate survivors through a radar response. SART means Search and Rescue Transponder.
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A training question asks for voice transmission on VHF channel 70. What is the conceptual error?
پاسخ
Channel 70 is for DSC, not radiotelephony.
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What is a METAREA used to coordinate?
پاسخ
Marine meteorological warnings and forecasts for a defined sea area.
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Which IAMSAR volume is intended for vessels and other mobile facilities?
پاسخ
Volume III, Mobile Facilities.
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Why can an HF link become unreliable during disturbed space weather?
پاسخ
Changes in the ionosphere can degrade or disrupt HF propagation.
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Which radar band does a GMDSS radar SART use?
پاسخ
9.2–9.5 GHz, in the 9 GHz/X-band radar region.
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Why is preventing false distress alerts a safety issue?
پاسخ
False alerts can divert search-and-rescue resources from real emergencies.
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Does receiving a NAVTEX transmitter’s signal prove that every received warning concerns the ship’s position?
پاسخ
No. Radio coverage and the transmitter’s defined service area are different concepts.
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A training display says an RLS alert was received. What rescue outcome must not be inferred?
پاسخ
That rescue units have already been dispatched or will arrive at a particular time.
کارت ۸۰
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How does an AIS-SART provide a locating signal?
پاسخ
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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