Do commercial aircraft have Geographical Position Systems?

Yes they do, or they wouldn't be albe to navavigate so successfully. Yes, all modern aircraft with on-board computers use GPS to plot courses. They have a Multi-Mode Reciever on board to receive the GPS data. Two new items under developement is plotting the aircraft on the runway using GPS coordinates. The pilot and Air Traffic Controller will have a display of the airport and runways and position of your a/c and other aircraft. Another item is Satellite Tracking of aircraft as opposed to tracking using ground-based radar. This plan would make the radar obsolete. All aircraft positions would be reported by GPS and plotted on a display that collects the data from all aircraft. Custermen Reference Links: FAA site on Global Navigation Satellite Systems