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