GMDSS: Element 3

1. A A measurable amount of time is required to send and receive a radio signal through the Earth's atmosphere.
2. B The difference between the peak values of two DC voltages may be used to determine an aircraft's distance to another aircraft.
3. C A measurable frequency compression of an AC signal may be used to determine an aircraft's altitude above the earth.
4. D A phase inversion between two AC voltages may be used to determine an aircraft's distance to the exit ramp of an airport's runway.

Tip: press A-D to answer