A flight guidance system providing perspective flight guidance symbology using
positioning and terrain information provides increased pilot situational awareness
of the pilot's aircraft. The guidance system uses a positioning system and a detailed
mapping system to provide a perspective display for use in an aircraft. A precision
pathway flight guidance (PFG) symbology set is thereby displayed on a pilot display.
The PFG symbology set includes broken line symbols representing an open tunnel
and providing flow field data, a half-bracket symbol to indicate that the aircraft
is no longer in the open tunnel represented by the broken line symbols and a quickened
flight path vector (QFPV) symbol to provide the pilot with predictive flight path
information. A flight director system and tunnel generator component provide for
updating the displayed PDFG symbology set based upon current aircraft conditions
(e.g., aircraft position) and stored flight path information.