A mechanical computer used in tandem with a GPS to approach, enter and fly the
traffic pattern of any uncontrolled airport. Pilots must navigate to a relatively
small area or approach point before entering the traffic pattern of an uncontrolled
airport. While airports are programmed into GPS units, the approach points are
not. The computer works in tandem with an onboard GPS unit programmed for navigation
direct to the airport of intended landing and employs triangulation to navigate
to an approach point from which a proper traffic pattern entry can be made.