The LORAN-C transmitter Havre was the master station of the North-Central U.S. LORAN-C Chain (GRI 8290), situated at Havre, Montana at 48°44′39″N 109°58′54″W. It used a 700-foot (210 m) tall mast radiator as an antenna with a transmission power of 400 kW.
The station was closed on February 8, 2010 as a budget cut. The station, and all of the others, were considered to be obsolete with the general availability of GPS systems.
References
LORAN-C transmitter Havre Wikipedia(Text) CC BY-SA