Long before the space age, people used the heavens for navigation. Besides relying on the Sun, Moon, and stars, the early travellers invented the magnetic compass, the sextant, and the seagoing chronometer. Eventually, radio navigation in which a...

Global Navigation Satellite System (GNSS) is the standard generic term for satellite navigation systems that provide autonomous geo-spatial positioning with global coverage. A GNSS allows small electronic receivers to determine their location...