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