flying RAF aircraft, and thus beyond the range of Oboe. The campaign had to depend upon straight navigation and H2S. Bomber Command's efforts against Berlin
distance from one of the Oboe stations to the target was measured and an arc of that radius drawn on a conventional navigation chart. For instance, for
concentrate its advanced navigational systems in the Pathfinder units. Most widely used were the H2S ground scanning radar and Oboenavigation system, the former
radio navigation system, still in use (US and Canadian operations terminated 2010). CHAYKA, the Russian counterpart of LORAN SHORAN Oboe (navigation) G-H