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