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There are many separate GPS systems and all the big powers know how to jam and work without them. It was one of the first tactics used in Ukraine.

• rtkwe 17d ago
  Of course. But those are also limited to the areas around the jammers too. In a broader hot conflict there'd be a good reason to disrupt the opposition's GPS capabilities across the globe not just locally. It'd be pretty bad economically for many countries to lose GPS access in their homeland but difficult to achieve without a way to disrupt the satellites directly.