GMDSS GOC Flashcards: Radio Concepts and Terminology

Question 1

In maritime radio, what does GMDSS stand for?

Accepted Answer

Global Maritime Distress and Safety System.

Question 2

In the CEPT maritime-radio syllabus, what does GOC stand for?

Accepted Answer

General Operator’s Certificate.

Question 3

What does a radio frequency of 1 Hz represent?

Accepted Answer

One cycle per second.

Question 4

In GMDSS, what does MSI stand for?

Accepted Answer

Maritime Safety Information.

Question 5

Which international organisation develops the maritime safety framework behind GMDSS?

Accepted Answer

The International Maritime Organization (IMO).

Question 6

Which international organisation maintains the Radio Regulations used by maritime radio services?

Accepted Answer

The International Telecommunication Union (ITU).

Question 7

GMDSS combines which two broad communication paths?

Accepted Answer

Terrestrial radio and satellite communication.

Question 8

In maritime radio, what does DSC stand for?

Accepted Answer

Digital Selective Calling.

Question 9

Which maritime emergency category means grave and imminent danger requiring immediate assistance?

Accepted Answer

Distress.

Question 10

What is the purpose of NAVTEX?

Accepted Answer

Automatic reception of broadcast maritime safety information as text.

Question 11

In maritime radio, what does MMSI stand for?

Accepted Answer

Maritime Mobile Service Identity.

Question 12

In maritime satellite communications, what does SES stand for?

Accepted Answer

Ship Earth Station: the satellite-communication station aboard a ship.

Question 13

In maritime safety, what does EPIRB stand for?

Accepted Answer

Emergency Position-Indicating Radio Beacon.

Question 14

How many hertz are in 1 kHz?

Accepted Answer

1000 Hz.

Question 15

In maritime communications, what does SAR stand for?

Accepted Answer

Search and Rescue.

Question 16

What is the basic role of maritime DSC?

Accepted Answer

Establishing contact and transferring calling or alert information using digital codes.

Question 17

In radio spectrum terminology, what does MF mean?

Accepted Answer

Medium frequency: 300 kHz to 3 MHz.

Question 18

What is the international NAVTEX frequency?

Accepted Answer

518 kHz.

Question 19

How many digits does an MMSI contain?

Accepted Answer

Nine digits.

Question 20

Which category concerns an urgent safety message without the distress condition requiring immediate assistance?

Accepted Answer

Urgency.

Question 21

In radio spectrum terminology, what does HF mean?

Accepted Answer

High frequency: 3 to 30 MHz.

Question 22

In GMDSS, what does RMSS mean?

Accepted Answer

Recognised Mobile Satellite Service: a satellite service recognised by IMO for GMDSS.

Question 23

How many kilohertz are in 1 MHz?

Accepted Answer

1000 kHz.

Question 24

In a NAVTEX header, what does B1 identify?

Accepted Answer

The transmitter.

Question 25

In radio spectrum terminology, what does VHF mean?

Accepted Answer

Very high frequency: 30 to 300 MHz.

Question 26

Which category announces navigation-safety information or important meteorological warnings?

Accepted Answer

Safety.

Question 27

Which radio coverage defines GMDSS sea area A1?

Accepted Answer

VHF coast-station voice coverage with continuous DSC alerting, as defined by a Contracting Government.

Question 28

What do the Maritime Identification Digits in an MMSI identify?

Accepted Answer

The administration with jurisdiction over the station.

Question 29

In a NAVTEX header, what does B2 identify?

Accepted Answer

The message subject category.

Question 30

Which spoken maritime radio signal denotes distress?

Accepted Answer

MAYDAY.

Question 31

Which radio coverage defines GMDSS sea area A2?

Accepted Answer

MF coast-station voice coverage with continuous DSC alerting, outside A1, as defined by a Contracting Government.

Question 32

What atmospheric region enables HF skywave communication beyond the horizon?

Accepted Answer

The ionosphere.

Question 33

What do the B3B4 characters in a NAVTEX header represent?

Accepted Answer

The two-digit message number.

Question 34

Which spoken maritime radio signal denotes urgency?

Accepted Answer

PAN PAN.

Question 35

Since 1 January 2024, what determines a ship’s GMDSS sea area A3?

Accepted Answer

Its carried ship earth station’s recognised mobile satellite service coverage with continuous alerting, outside A1 and A2.

Question 36

Which language is used by the international NAVTEX service on 518 kHz?

Accepted Answer

English.

Question 37

In ITU radio terminology, how do the two directions operate in simplex communication?

Accepted Answer

Alternately: one direction transmits at a time.

Question 38

Which spoken maritime radio signal introduces safety traffic?

Accepted Answer

SÉCURITÉ (SECURITE).

Question 39

How is GMDSS sea area A4 defined?

Accepted Answer

The area outside A1, A2 and that ship’s A3.

Question 40

Which NAVTEX subject category does B2 = A represent?

Accepted Answer

Navigational warnings.

Question 41

In ITU radio terminology, what does duplex operation permit?

Accepted Answer

Simultaneous transmission in both directions.

Question 42

What is the priority order of distress, urgency, safety and routine radio traffic?

Accepted Answer

Distress → urgency → safety → routine.

Question 43

Which marine VHF channel is reserved for DSC?

Accepted Answer

Channel 70, 156.525 MHz; it is not a voice channel.

Question 44

Which NAVTEX subject category does B2 = B represent?

Accepted Answer

Meteorological warnings.

Question 45

Which frequency band identifies the satellite distress-alerting function of a modern EPIRB?

Accepted Answer

406 MHz.

Question 46

What are bridge-to-bridge communications in GMDSS terminology?

Accepted Answer

Safety radio communications between ships from their navigating positions.

Question 47

Which marine VHF channel carries radiotelephony distress and safety traffic?

Accepted Answer

Channel 16, 156.8 MHz.

Question 48

Which NAVTEX subject category does B2 = E represent?

Accepted Answer

Meteorological forecasts.

Question 49

What does integrated GNSS add to an EPIRB distress alert?

Accepted Answer

An encoded position from a Global Navigation Satellite System, helping rescuers locate the beacon.

Question 50

Which GMDSS communication function concerns units at the incident location?

Accepted Answer

On-scene communications.

Question 51

Which MF frequency is used for DSC distress and safety calling?

Accepted Answer

2187.5 kHz.

Question 52

Which NAVTEX subject category does B2 = C represent?

Accepted Answer

Ice reports.

Question 53

Why does accurate EPIRB registration help rescue authorities?

Accepted Answer

It links the beacon identity to vessel and contact information.

Question 54

What is the purpose of a GMDSS reserve source of energy?

Accepted Answer

Powering distress and safety radio equipment if main and emergency electrical supplies fail.

Question 55

Which MF frequency is used for radiotelephony distress and safety communications?

Accepted Answer

2182 kHz.

Question 56

Name the lower-frequency national NAVTEX channel distinct from international 518 kHz.

Accepted Answer

490 kHz; availability and language depend on the national service.

Question 57

What is the role of an EPIRB’s low-power 121.5 MHz signal?

Accepted Answer

Local homing by rescue units; Cospas-Sarsat satellites no longer process 121.5 MHz alerts.

Question 58

Does the CEPT GOC syllabus assess theory alone?

Accepted Answer

No. It requires theoretical and practical tests.

Question 59

At the same wave speed, what happens to wavelength when frequency rises?

Accepted Answer

Wavelength becomes shorter.

Question 60

In maritime satellite safety broadcasts, what does EGC stand for?

Accepted Answer

Enhanced Group Call.

Question 61

What is the purpose of a float-free EPIRB’s hydrostatic release?

Accepted Answer

Releasing the beacon from its bracket when submerged, so it can float free.

Question 62

Why does GMDSS communication planning consider the whole voyage?

Accepted Answer

Service coverage, relevant stations and safety-information areas can change along the route.

Question 63

What is the standard ship-station MMSI pattern, using MID and X placeholders?

Accepted Answer

MIDXXXXXX: three Maritime Identification Digits followed by six digits.

Question 64

Which named Inmarsat service broadcasts maritime safety information?

Accepted Answer

SafetyNET.

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