System of satellites in permanent orbit above the earth that allow a receiver unit to triangulate the position of the satellites on or above the earth’s surface.
Definition adapted from: Armantrout, N. B. compiler. 1998. Glossary of aquatic habitat inventory terminology. American Fisheries Society, Bethesda, Maryland.
For more, visit the Wikipedia entry for GPS, URL: http://en.wikipedia.org/wiki/Global_Positioning_System