[lqet]

Interestingly, if you have good map data, the relative "shape" of you previous trajectory is enough to locate your position globally, without GPS, even without knowing where north is.

https://ad-publications.informatik.uni-freiburg.de/GIS_paths...

[andrewmcwatters]

Thank you for sharing this. I do work in this space and had not come across this before.