GOC Sea Areas & Propagation Quiz

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1. Which GMDSS Sea Area is covered by VHF coast stations with continuous DSC alerting?

Sea Area A1
Sea Area A2
Sea Area A3
Sea Area A4

2. What is the primary factor affecting MF radio wave propagation?

Time of day
Ground conductivity
Solar flares
Atmospheric pressure

3. Which frequency band is most suitable for long-distance communication during the day?

MF
HF
VHF
UHF

4. What is the typical range of VHF radio communication over the sea?

10-15 nautical miles
20-30 nautical miles
50-60 nautical miles
70-80 nautical miles

5. Which GMDSS Sea Area is defined by the coverage of MF coast stations with continuous DSC alerting?

Sea Area A1
Sea Area A2
Sea Area A3
Sea Area A4

6. What is the main characteristic of HF radio waves?

Line-of-sight propagation
Skywave propagation
Groundwave propagation
Tropospheric scatter

7. Which GMDSS Sea Area covers regions not within A1, A2, or A3?

Sea Area A1
Sea Area A2
Sea Area A3
Sea Area A4

8. What is the primary mode of propagation for MF radio waves?

Skywave
Groundwave
Tropospheric scatter
Space wave

9. Which frequency band is least affected by atmospheric conditions?

HF
VHF
MF
UHF

10. What is the main limitation of HF radio communication?

Limited range
Variability due to ionospheric conditions
High power requirements
Line-of-sight restriction

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