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Military has used inertial guidance systems in the past. Subs used them to navigate under the ice caps and in deep water, before the days of GPS. ICBMs used them to. The only problem is they slowly lose accuracy. They would also have to put the robot in the exact same orientation each time so it would know where to start. I doubt it would be very acurate after a hard hit because most accelerometers only work to a certain point.
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