For one, there are many satellite navigation systems. US has GPS, Europe has Galileo, Russia has Glonass and China something else (I can't remember the name).
Second, GPS is easy to jam, so actually a lot of important military stuff doesn't depend on it. There are some lower-cost precision munitions that do, and indeed in Ukraine they are increasingly less and less effective. But everyone is aware of this, and so while incredibly useful, it's not that critical for this reason.
For one, there are many satellite navigation systems. US has GPS, Europe has Galileo, Russia has Glonass and China something else (I can't remember the name).
Second, GPS is easy to jam, so actually a lot of important military stuff doesn't depend on it. There are some lower-cost precision munitions that do, and indeed in Ukraine they are increasingly less and less effective. But everyone is aware of this, and so while incredibly useful, it's not that critical for this reason.