GPS

TSO-C129/C196 (Non-WAAS)

• TSO-C129 is an older technical standard for GPS
• TSO-C129 was developed for lower accuracy than TSO-C196
• TSO-C196 defines GPS sensor equipment
• Both TSO-C129 all revisions (AR) and TSO-C196 equipment require other positioning and navigation systems appropriate to the operation on-board the aircraft due to equipment limitations.

TSO-C145/146 (WAAS)

Receiver includes Fault Detection and Exclusion, which means that after a single signal error has been detected, flight operations can continue with accuracy guaranteed using the remaining satellites available. A C129 receiver only possesses Fault Detection, but not Exclusion. Once a C129 receiver detects a signal error, it can only report the error - at that point it can no longer guaranty accuracy.