LORAN is now at the LORAN C version. Was very popular inthe 1990's in the US GA community as an area navigation system, also some instrument approaches were written but there were some problems with getting useful minima. With the advent of GPS receivers of reasonable cost many of the thousands of LORAN C receivers were replaced in GA. LAst LOARAN C ground station mfg I know of was RACAL Megapulse.. .. .Interesting how the GPS uses the same kind of time/distance/angle information, albeit much more accurate and from the ultimate high ground, as the pioneering systems.