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