Monday, January 12, 2009

Celestial Navigation 3 Star Running Fix

A running fix is generally accepted, from pilot­ing, as a fix where earlier LOP's are advanced to cross a later LOP. In celestial navigation this is also true up to a point. When several obser­vations of different bodies are taken in a relatively short period of time (5 to 30 minutes), the resulting fix is regarded as a simultaneous fix rather than a running fix, even though the earlier LOP's are advanced to the final LOP time. Star fixes taken at morning or evening twilight are exam­ples of these fixes.