Introduction
The following pages describe the aircraft navigation capabilities developed by the ATM project. The project team has developed a range of techniques which enable NASA to guide a remote-sensing aircraft, and its sensor swath, along a very precisely-defined path. A variety of hardware is used to implement these techniques, including computers, GPS receivers, visual pilot displays and electronic interfaces with aircraft systems. When this hardware is packaged into equipment racks and installed aboard remote-sensing aircraft, it is known as the "GPFMS" system.