Title: Navigation at Sea, History of - important, system, marine, human
Headings: Navigation at Sea, History of
Navigation at Sea, History of
Early Navigational Tools
Mariner's Compass.
Nautical Charts.
Astrolabe, Sextant, and Chip Log.
Longitude and the Chronometer.
Modern Navigation
Gyroscopic Compass.
Radar.
Loran.
GPS.
Bibliography
Internet Resources
User Contributions:
Phoenix
Shaylee
adrienne
Lyman Ward
Leesa

Content: GPS. In the late twentieth century, the global positioning system (GPS)  largely replaced the Loran. GPS uses the same principle of time  difference from separate signals as Loran, but the signals come from  satellites. As of 2002, the system consisted of 24 satellites, and gave  the mariner a position with accuracy of 9 meters (30 feet) or less. SEE ALSO Cook, Captain James ; Geospatial Technologies ; Transportation . Amy J. Bratcher
Bibliography
Rosenbach Company. The Sea: Books and Manuscripts on the Art of Navigation, Geography,  Naval History, Shipbuilding, Voyages, Shipwrecks, and Mathematics,  Including Atlases and Maps.