Final answer:
The most widely used means of radio navigation, a ground-based short-range navaid, is the Global Positioning System (GPS). It relies on an array of 24 satellites orbiting the Earth and calculates position based on the time signals from those satellites reach the receiver.
Step-by-step explanation:
The most widely used means of radio navigation, a ground-based short-range navaid, is the Global Positioning System (GPS). GPS relies on an array of 24 satellites orbiting the Earth, and at least 4 of them are visible from any spot on Earth. Each satellite carries a precise atomic clock. Your GPS receiver detects the signals from those satellites that are overhead and calculates your position based on the time that it has taken those signals to reach you. GPS technology is widely implemented in the transport of people, goods, and services around the world.