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