How does GPS spoofing happen, can some explain how the IDF can do this and does it require permission of US Gov?
A GPS positioning device looks for and reads those signals and then performs a triangulation calculation.
Spoofing these signals means outputting identical but incorrect ones either from your own constellation of satellites or from ground-based arrays/emitters.
Typically military hardware expects a certain level of spoofing and has it's own built-in countermeasures/security checks so effective jamming/spoofing means successfully navigating these countermeasures either through brute force or accurate intelligence.