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