[GingisK]

People don't seem to understand how GPS works. Consider this explanation: GPS satellites synchronize with each other so that they are at the same time mark. This takes into account the time needed between units. The satellites then simply broadcast a very short signal that carries a time signature. They also broadcast tables used in navigation computations. The receivers receive the time-laden pips and then compute the distance to each satellite. The aforementioned tables carry time-dependent information regarding the orbital positions of the satellites. The intersections of the imaginary spheres given by the distance to each satellite are computed. The computed intersections of those spheres give the position and altitude fix of the receiver.

The messages from the satellites are protected with long cyclic redundancy checks in order to prevent garbled messages from contributing to the calculations.

In short, GPS satellites do not tell you your position. They tell you their positions. From that the receiver computes its own position.

Spoofing would require replacing the temporal tables and time fix transmissions from multiple satellites in such a manner to seem reasonable to the receiver's algorithm. That is so unlikely. Jamming the signals altogether would be more likely, merely causing fallback to inertial navigation.

[null and void]

VERY bad news. It means the receivers are buggered to give false results near Russian targets.

DEEP sabotage, perhaps at the chip level*, Perhaps at the software vendor level**, perhaps at the factory/depot level***.

* Chinese manufactured chips?
** Software outsourced to who, Russia, India, China?
*** Native traitors?