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.
حول هذه الرزمة
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.
بطاقات هذه الرزمة
البطاقة ١
السؤال
In maritime radio, what does GMDSS stand for?
الإجابة
Global Maritime Distress and Safety System.
البطاقة ٢
السؤال
In the CEPT maritime-radio syllabus, what does GOC stand for?
الإجابة
General Operator’s Certificate.
البطاقة ٣
السؤال
What does a radio frequency of 1 Hz represent?
الإجابة
One cycle per second.
البطاقة ٤
السؤال
In GMDSS, what does MSI stand for?
الإجابة
Maritime Safety Information.
البطاقة ٥
السؤال
Which international organisation develops the maritime safety framework behind GMDSS?
الإجابة
The International Maritime Organization (IMO).
البطاقة ٦
السؤال
Which international organisation maintains the Radio Regulations used by maritime radio services?
الإجابة
The International Telecommunication Union (ITU).
البطاقة ٧
السؤال
GMDSS combines which two broad communication paths?
الإجابة
Terrestrial radio and satellite communication.
البطاقة ٨
السؤال
In maritime radio, what does DSC stand for?
الإجابة
Digital Selective Calling.
البطاقة ٩
السؤال
Which maritime emergency category means grave and imminent danger requiring immediate assistance?
الإجابة
Distress.
البطاقة ١٠
السؤال
What is the purpose of NAVTEX?
الإجابة
Automatic reception of broadcast maritime safety information as text.
البطاقة ١١
السؤال
In maritime radio, what does MMSI stand for?
الإجابة
Maritime Mobile Service Identity.
البطاقة ١٢
السؤال
In maritime satellite communications, what does SES stand for?
الإجابة
Ship Earth Station: the satellite-communication station aboard a ship.
البطاقة ١٣
السؤال
In maritime safety, what does EPIRB stand for?
الإجابة
Emergency Position-Indicating Radio Beacon.
البطاقة ١٤
السؤال
How many hertz are in 1 kHz?
الإجابة
1000 Hz.
البطاقة ١٥
السؤال
In maritime communications, what does SAR stand for?
الإجابة
Search and Rescue.
البطاقة ١٦
السؤال
What is the basic role of maritime DSC?
الإجابة
Establishing contact and transferring calling or alert information using digital codes.
البطاقة ١٧
السؤال
In radio spectrum terminology, what does MF mean?
الإجابة
Medium frequency: 300 kHz to 3 MHz.
البطاقة ١٨
السؤال
What is the international NAVTEX frequency?
الإجابة
518 kHz.
البطاقة ١٩
السؤال
How many digits does an MMSI contain?
الإجابة
Nine digits.
البطاقة ٢٠
السؤال
Which category concerns an urgent safety message without the distress condition requiring immediate assistance?
الإجابة
Urgency.
البطاقة ٢١
السؤال
In radio spectrum terminology, what does HF mean?
الإجابة
High frequency: 3 to 30 MHz.
البطاقة ٢٢
السؤال
In GMDSS, what does RMSS mean?
الإجابة
Recognised Mobile Satellite Service: a satellite service recognised by IMO for GMDSS.
البطاقة ٢٣
السؤال
How many kilohertz are in 1 MHz?
الإجابة
1000 kHz.
البطاقة ٢٤
السؤال
In a NAVTEX header, what does B1 identify?
الإجابة
The transmitter.
البطاقة ٢٥
السؤال
In radio spectrum terminology, what does VHF mean?
الإجابة
Very high frequency: 30 to 300 MHz.
البطاقة ٢٦
السؤال
Which category announces navigation-safety information or important meteorological warnings?
الإجابة
Safety.
البطاقة ٢٧
السؤال
Which radio coverage defines GMDSS sea area A1?
الإجابة
VHF coast-station voice coverage with continuous DSC alerting, as defined by a Contracting Government.
البطاقة ٢٨
السؤال
What do the Maritime Identification Digits in an MMSI identify?
الإجابة
The administration with jurisdiction over the station.
البطاقة ٢٩
السؤال
In a NAVTEX header, what does B2 identify?
الإجابة
The message subject category.
البطاقة ٣٠
السؤال
Which spoken maritime radio signal denotes distress?
الإجابة
MAYDAY.
البطاقة ٣١
السؤال
Which radio coverage defines GMDSS sea area A2?
الإجابة
MF coast-station voice coverage with continuous DSC alerting, outside A1, as defined by a Contracting Government.
البطاقة ٣٢
السؤال
What atmospheric region enables HF skywave communication beyond the horizon?
الإجابة
The ionosphere.
البطاقة ٣٣
السؤال
What do the B3B4 characters in a NAVTEX header represent?
الإجابة
The two-digit message number.
البطاقة ٣٤
السؤال
Which spoken maritime radio signal denotes urgency?
الإجابة
PAN PAN.
البطاقة ٣٥
السؤال
Since 1 January 2024, what determines a ship’s GMDSS sea area A3?
الإجابة
Its carried ship earth station’s recognised mobile satellite service coverage with continuous alerting, outside A1 and A2.
البطاقة ٣٦
السؤال
Which language is used by the international NAVTEX service on 518 kHz?
الإجابة
English.
البطاقة ٣٧
السؤال
In ITU radio terminology, how do the two directions operate in simplex communication?
الإجابة
Alternately: one direction transmits at a time.
البطاقة ٣٨
السؤال
Which spoken maritime radio signal introduces safety traffic?
الإجابة
SÉCURITÉ (SECURITE).
البطاقة ٣٩
السؤال
How is GMDSS sea area A4 defined?
الإجابة
The area outside A1, A2 and that ship’s A3.
البطاقة ٤٠
السؤال
Which NAVTEX subject category does B2 = A represent?
الإجابة
Navigational warnings.
البطاقة ٤١
السؤال
In ITU radio terminology, what does duplex operation permit?
الإجابة
Simultaneous transmission in both directions.
البطاقة ٤٢
السؤال
What is the priority order of distress, urgency, safety and routine radio traffic?
الإجابة
Distress → urgency → safety → routine.
البطاقة ٤٣
السؤال
Which marine VHF channel is reserved for DSC?
الإجابة
Channel 70, 156.525 MHz; it is not a voice channel.
البطاقة ٤٤
السؤال
Which NAVTEX subject category does B2 = B represent?
الإجابة
Meteorological warnings.
البطاقة ٤٥
السؤال
Which frequency band identifies the satellite distress-alerting function of a modern EPIRB?
الإجابة
406 MHz.
البطاقة ٤٦
السؤال
What are bridge-to-bridge communications in GMDSS terminology?
الإجابة
Safety radio communications between ships from their navigating positions.
البطاقة ٤٧
السؤال
Which marine VHF channel carries radiotelephony distress and safety traffic?
الإجابة
Channel 16, 156.8 MHz.
البطاقة ٤٨
السؤال
Which NAVTEX subject category does B2 = E represent?
الإجابة
Meteorological forecasts.
البطاقة ٤٩
السؤال
What does integrated GNSS add to an EPIRB distress alert?
الإجابة
An encoded position from a Global Navigation Satellite System, helping rescuers locate the beacon.
البطاقة ٥٠
السؤال
Which GMDSS communication function concerns units at the incident location?
الإجابة
On-scene communications.
البطاقة ٥١
السؤال
Which MF frequency is used for DSC distress and safety calling?
الإجابة
2187.5 kHz.
البطاقة ٥٢
السؤال
Which NAVTEX subject category does B2 = C represent?
الإجابة
Ice reports.
البطاقة ٥٣
السؤال
Why does accurate EPIRB registration help rescue authorities?
الإجابة
It links the beacon identity to vessel and contact information.
البطاقة ٥٤
السؤال
What is the purpose of a GMDSS reserve source of energy?
الإجابة
Powering distress and safety radio equipment if main and emergency electrical supplies fail.
البطاقة ٥٥
السؤال
Which MF frequency is used for radiotelephony distress and safety communications?
الإجابة
2182 kHz.
البطاقة ٥٦
السؤال
Name the lower-frequency national NAVTEX channel distinct from international 518 kHz.
الإجابة
490 kHz; availability and language depend on the national service.
البطاقة ٥٧
السؤال
What is the role of an EPIRB’s low-power 121.5 MHz signal?
الإجابة
Local homing by rescue units; Cospas-Sarsat satellites no longer process 121.5 MHz alerts.
البطاقة ٥٨
السؤال
Does the CEPT GOC syllabus assess theory alone?
الإجابة
No. It requires theoretical and practical tests.
البطاقة ٥٩
السؤال
At the same wave speed, what happens to wavelength when frequency rises?
الإجابة
Wavelength becomes shorter.
البطاقة ٦٠
السؤال
In maritime satellite safety broadcasts, what does EGC stand for?
الإجابة
Enhanced Group Call.
البطاقة ٦١
السؤال
What is the purpose of a float-free EPIRB’s hydrostatic release?
الإجابة
Releasing the beacon from its bracket when submerged, so it can float free.
البطاقة ٦٢
السؤال
Why does GMDSS communication planning consider the whole voyage?
الإجابة
Service coverage, relevant stations and safety-information areas can change along the route.
البطاقة ٦٣
السؤال
What is the standard ship-station MMSI pattern, using MID and X placeholders?
الإجابة
MIDXXXXXX: three Maritime Identification Digits followed by six digits.
البطاقة ٦٤
السؤال
Which named Inmarsat service broadcasts maritime safety information?
الإجابة
SafetyNET.
البطاقة ٦٥
السؤال
Does a beacon Return Link Service (RLS) indication mean a rescue has been launched?
الإجابة
No. It confirms receipt, localisation and forwarding of the alert, not launch of a rescue.
البطاقة ٦٦
السؤال
Two ships share a position outside A1/A2 but carry different RMSS terminals. Must their A3 coverage match?
الإجابة
No. A3 depends on the RMSS supported by each ship’s carried earth station.
البطاقة ٦٧
السؤال
What is the coast-station MMSI pattern, using MID and X placeholders?
الإجابة
00MIDXXXX: two leading zeros, the MID, then four digits.
البطاقة ٦٨
السؤال
Which named Iridium service broadcasts maritime safety information?
الإجابة
SafetyCast.
البطاقة ٦٩
السؤال
Why use an EPIRB’s approved self-test instead of ordinary activation for practice?
الإجابة
Ordinary activation can transmit a real distress alert and divert rescue resources.
البطاقة ٧٠
السؤال
What is a NAVAREA used to coordinate?
الإجابة
Navigational warnings for a defined sea area.
البطاقة ٧١
السؤال
What is the primary role of a radar SART?
الإجابة
Helping nearby rescue units locate survivors through a radar response. SART means Search and Rescue Transponder.
البطاقة ٧٢
السؤال
A training question asks for voice transmission on VHF channel 70. What is the conceptual error?
الإجابة
Channel 70 is for DSC, not radiotelephony.
البطاقة ٧٣
السؤال
What is a METAREA used to coordinate?
الإجابة
Marine meteorological warnings and forecasts for a defined sea area.
البطاقة ٧٤
السؤال
Which IAMSAR volume is intended for vessels and other mobile facilities?
الإجابة
Volume III, Mobile Facilities.
البطاقة ٧٥
السؤال
Why can an HF link become unreliable during disturbed space weather?
الإجابة
Changes in the ionosphere can degrade or disrupt HF propagation.
البطاقة ٧٦
السؤال
Which radar band does a GMDSS radar SART use?
الإجابة
9.2–9.5 GHz, in the 9 GHz/X-band radar region.
البطاقة ٧٧
السؤال
Why is preventing false distress alerts a safety issue?
الإجابة
False alerts can divert search-and-rescue resources from real emergencies.
البطاقة ٧٨
السؤال
Does receiving a NAVTEX transmitter’s signal prove that every received warning concerns the ship’s position?
الإجابة
No. Radio coverage and the transmitter’s defined service area are different concepts.
البطاقة ٧٩
السؤال
A training display says an RLS alert was received. What rescue outcome must not be inferred?
الإجابة
That rescue units have already been dispatched or will arrive at a particular time.
البطاقة ٨٠
السؤال
How does an AIS-SART provide a locating signal?
الإجابة
By transmitting search-and-rescue locating information on Automatic Identification System (AIS) frequencies.
٨٠ بطاقة
GMDSS GOC Flashcards: Radio Concepts and Terminology
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