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