The Global Positioning System (GPS) is quickly becoming part of the fabric of everyday life. Beyond recreational activities such as boating and backpacking, GPS receivers are becoming a very important tool to such industries as agriculture, transportation, and surveying. Very soon, every cell phone will incorporate GPS technology to aid first responders in answering emergency calls.
Stombaugh, Timothy S.; McLaren, Doug; and Koostra, Benjamin K., "The Global Positioning System" (2005). Agricultural Engineering Extension Publications. 5.