GMDSS Satellite Quiz

1. What is the primary purpose of a satellite communication system in GMDSS?

To provide long-range communication for distress and safety.
To track the position of a vessel.
To monitor weather conditions.
To communicate between ships in close proximity.

2. Which of the following is a satellite system used for distress communications in GMDSS?

Inmarsat.
VHF DSC.
AIS.
Navtex.

3. What is the minimum number of satellites required for a distress alert to be relayed?

One.
Two.
Three.
Four.

4. What is the frequency range used for satellite communication in the GMDSS?

1 GHz to 2 GHz.
3 GHz to 5 GHz.
6 GHz to 8 GHz.
12 GHz to 14 GHz.

5. What is the role of the Inmarsat-C system?

To provide distress alerts and general communication.
To provide satellite navigation information.
To monitor vessel position in real time.
To send meteorological data to ships.

6. Which satellite communication system is primarily used for sending distress alerts in the GMDSS?

Inmarsat D+.
Iridium.
COSPAS-SARSAT.
Globalstar.

7. How does a satellite communicate with a vessel’s distress alert system?

By direct satellite-to-ship communication.
By relaying distress information to a ground station.
By broadcasting an alert on a specific radio frequency.
By sending a signal to the nearest vessel.

8. What is the purpose of an EPIRB in satellite communication?

To send distress signals to satellites.
To provide real-time position tracking.
To transmit weather data to authorities.
To establish direct communication with shore stations.

9. Which satellite system operates in the L-band frequency?

Iridium.
Inmarsat.
GPS.
COSPAS-SARSAT.

10. How is a vessel’s position determined in satellite communication systems?

Using GPS coordinates.
Using radar signals.
Using VHF triangulation.
Using radio direction finding.

11. Which of the following is a feature of the Inmarsat I-4 satellite system?

Global coverage for voice and data.
Low-earth orbit positioning.
Limited to polar regions.
Only used for distress messages.

12. What is a primary advantage of using satellite systems in GMDSS over VHF systems?

Satellite systems can provide global coverage.
VHF systems are better suited for distress signals.
VHF systems have faster transmission times.
Satellite systems are cheaper to maintain.

13. How does the COSPAS-SARSAT system work?

It uses satellites to receive and relay distress signals from EPIRBs.
It transmits weather information to vessels.
It monitors vessel’s positions and sends alerts.
It allows direct communication between ships.

14. What is the maximum operational range of an EPIRB?

100 miles.
1000 miles.
10,000 miles.
Global coverage.

15. Which type of satellite communication system is used by the GMDSS for emergency distress alerts?

Inmarsat-C.
Globalstar.
Iridium.
Navtex.

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