from a minimum of 12 GPS satellites at least one time per second to obtain maximum accuracy,
which is encoded on an 8-mm tape. An inertial measurement unit associated with aircraft
avionics systems determines the required correction for the aircraft’s roll, pitch, and heading,
which is referenced to the GPS time tag. Together, these two instruments calculate the aircraft
position and orientation 50 times per second. The aircraft position and orientation are recorded at
an unprecedented accuracy and reliability within the range of a few centimeters.