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