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Environment/Versions GPS PosApp (SimGEN, SimREPLAY, SimREPLAYplus) SimPLEX  Answer The "NATO Standard Agreement STANAG 4294" is a document created that defines system characteristics of GPS essential for the design of receivers and use by Military services belonging to NATO.  STANAG Stands for "Standardized Agreement". This document was created in 1991. The STANAG has not been updated. A lot of the information in the STANAG is the same as the IS-GPS-200 document. The first Spirent simulators were designed using this standard.  While some of the elements of the STANAG still remain in the Spirent Simulators, we generally follow the IS-GPS-200 Interface specification to be compliant with the latest standards. This is currently IS-GPS-200F. One exception is the Minimum received power level (see FAQ14116).