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Re:Drug Traffickers Are Spoofing Border Drones by sbierwagen on Tuesday December 22, 2015 @01:01PM (#10779221)
IMUs are wildly expensive, and still have quite a lot of drift: https://news.ycombinator.com/item?id=10752294

Certainly the RQ-170 has an IMU, and I could believe it might use it as the primary means of navigation, but it's almost certainly corrected by GPS, which gives you a means of altering the drone's path by GPS spoofing.

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