Named after the protractor, a protractor compass consists of a baseplate, with an inscribed direction-of-travel arrow, and a rotating housing marked out in degrees, containing a magnetised compass needle. This allows bearings to be taken directly from the map, adjusted for magnetic declination, or recorded numerically and re-used.
Flying by vertical angles: unless you fly military hardware or something you built from a kit, it's unlikely you fly referencing angles. But there are things angles can do better than anything else.(IFR TECHNIQUE)
Jun 01, 2010; Aircraft performance parameters are typically expressed as measurements of speed (indicated and true), altitude and vertical...