Loran \Lor"an\ (l[^o]r"[a^]n or l[=o]r"[a^]n), n. [Acronym, from
   LOng RAnge Navigation] (Naut., aviation)
   A system of electronic navigation in which a vessel or
   aircraft determines its latitude and longitude by measuring
   the time differences between low frequency radio
   transmissions from two stationary transmitters (slaves) and a
   stationary master transmitter. Contrary to the name, Loran is
   a medium range system, usually effective for no more than a
   few hundred miles from shore. The first commercial system was
   called Loran A; the latest (and final) development is Loran
   C. [acronym]
   [RDH]