I don&#x27;t think the &#x27;National Security&#x27; aspect would result in Uncle Sam&#x27;s finest B52&#x27;s using Chinese &#x27;GPS&#x27; to then end up dropping their bombs 500m off course in every instance.<p>That would make a good story though, a full on first strike that missed every target &#x27;500m to the East&#x27; due to some mapping oversight.<p>However, as for real use &#x27;National Security&#x27;, you could hide some area by making it not exist with the surrounding area stretched a bit on the map to hide the secret area. With some natural features, or even a big forest, all kinds of things could be hidden from the general public (who are important and primary &#x27;targets&#x27; for &#x27;National Security&#x27;) if not Uncle Sam.