The LORAN (LOng RAnge Navigation) system was an American development of the British GEE radio navigation system used early in World War II. While GEE had a range of about 640 km, initial LORAN systems had a range of more than 1,900 km. LORAN was used by the US Navy, Royal Navy and Royal Air Force during the later stages of World War II, then came into widespread commercial and civilian use in the 1950s and 60s. The system was updated through the years to the current C-version standard.
Satellite navigation systems began replacing LORAN systems in commercial vessels in the early '90s. With the subsequent development of affordable, accurate and easy-to-use consumer GPS receivers, sales of LORAN units – once a staple in recreational boats – virtually evaporated.