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