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