Loran

 
Pronunciation: /ˈlɔːran, ˈlɒ-/

noun

[mass noun]
  • a system of long-distance navigation in which position is determined from the intervals between signal pulses received from widely spaced radio transmitters: he checked his bearings on the loran [as modifier]: a loran signal

Origin:

1940s: from lo(ng-)ra(nge) n(avigation)