Safety, Fire & Survival · GMDSS — Sea Areas
GMDSS sea area A1 is defined as the area within radiotelephone (VHF DSC) coverage of at least one:
- AInmarsat satellite
- BHF coast station
- CShore-based VHF coast station with continuous DSC alerting✓ Correct
- DNAVTEX transmitter
Explanation
A1 is within VHF range of a coast station with DSC (about 20-30 nm). A2 adds MF DSC coverage, A3 is Inmarsat (HF) coverage between roughly 70°N and 70°S, and A4 is the polar regions (HF).
Authority: SOLAS Chapter IV (GMDSS sea areas)
Practice the full Safety, Fire & Survival bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Safety, Fire & Survival questions
- Fire Theory
The three elements that must be present for a fire to burn (the fire triangle) are:
- Fire Theory
A fire involving flammable liquids such as gasoline, oil, or grease is what class of fire?
- Fire Theory
A fire in energized electrical equipment is class C. The first action that makes it safer to fight is to:
- Firefighting
Why is water the preferred agent for a Class A fire?
- Firefighting
A fixed CO2 flooding system extinguishes a fire in an engine room primarily by:
- Firefighting
Before releasing a fixed CO2 system into a machinery space, the operator must FIRST: