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Or even reverse engineer the firmware to remove the restriction. I'm also guessing that there are plenty of Chinese made gps devices that don't have that limitation. Simply because, why bother. Assuming you can find one accurate enough on AliExpress, I'd say there is a good chance it has no special restrictions.

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This is also what I would expect the reality of the situation to be, regardless of policy.

Not to mention that one would assume if someone can make a GPS-guided missile, they can sure as hell alter/find a workable GPS for their purpose...

It's not Joe Average will try to make a missile with a GPS from his Garmin watch...

But any number of non State actors would. The IRA or ISIS or Hezzbollah for example. They probably don't have the tech capabilities to RE their own GPS firmware, but non-orbiting rocket science isn't that hard. Iron Dome does okay against simple rockets, but a big guided rocket (V2 size) would be a different problem entirely.

Obviously drone attacks make use of GPS, and it's a worry to many -- for example, there is frequently GPS jamming when Putin is visiting somewhere.

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