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: It was used to locate  objects beyond range of vision by projecting radio waves against them. This was, and still is, very useful on ships to locate other ships and  land when visibility is reduced. Loran. The U.S. navigation system known as Long Range Navigation (Loran) was  developed between 1940 and 1943, and uses pulsed radio transmissions  from so-called "master" and "slave" stations  to determine a ship's position. The accuracy of Loran is measured  in hundreds of meters, but only has limited coverage. 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 ;