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There are also much simpler workarounds. Although not as precise, early cruise missiles simply used a gyroscope.

Another option would be hacking the enemie's GPS-like system. I assume we're already hard at work on that.

I imagine that the military is going to be much more effective without having to use workarounds. I doubt current munitions have extra weight dedicated to backup gyroscope navigation (could be wrong). Launching two dozen satellites has to be easier, faster, and cheaper than replacing the whole military's munitions stockpile with less effective weapons.

replying to sibling - i recall reading that ICBMs use celestial navigation.

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