loran

詳細解釋：

lo.ran

n.（名詞）
A long-range navigational system in which position is determined by an analysis involving the time intervals between pulsed radio signals from two or more pairs of ground stations of known position.
洛倫：一種長距離導航系統，通過對兩個或更多對已知位置的地面站發出的無信電脈衝的時間間隔的分析來測定方位

來源：
lo(ng-)ra(nge) n(avigation)
lo(ng-)ra(nge) n(avigation)