Originally Posted by
Alpine Flyer
A bit OT but Honeywell is testing star tracking and magnetic field anomaly as an alternative to GPS. I'd also suppose that general improvements in electronics will allow RLG INS to gain accuracy (e.g. by being able to detect smaller differences in frequency). What's almost equally amazing is the improvement in Piezo gyros for GA applications.
Very interesting, star tracking was used by the SR71 for navigation, it’s good to see alternatives to GPS being developed that can’t be jammed