Patent ID: 6804585
Filing Date: 2004-10-12
Classification: G01C,G08G

Abstract:
An electronic aviation flight navigation system comprising:a computer having an electronic display for use onboard an aircraft, said computer enabled with moving map GPS for displaying navigational positioning information; means for displaying an airport location relative to said aircraft along a flight path on a moving map display; means for calculating a glide range for the aircraft based on the aircraft's glide ratio and the altitude differential between said aircraft and said airport by obtaining the altitude of the aircraft above sea level from GPS data, obtaining the altitude of the airport above sea level from a database, calculating the differential between said airport altitude and said aircraft altitude, and multiplying said differential by said glide ratio; and means for displaying a generally circular symbol having a radius coresponding to said glide range and centering said circular symbol on said airport, thereby providing an indication of whether the aircraft is within gliding range of said airport.