I never heard anyone say it was "impossible", but I did hear many people suggest that a vision-only solution is statistically less-safe than a rangefinding-assi

I never heard anyone say it was "impossible", but I did hear many people suggest that a vision-only solution is statistically less-safe than a rangefinding-assisted solution. Technically you can make an autopilot work with nothing but inertial navigation. The Swedes did it in the 70s. The hard part is making it accurate and reliable, and catching the edge-cases.