Russia is already taking advantage of preloaded terrain imagery, according to the article:
The principle is already turning up on the other side of the front, where a downed Russian drone was found matching live camera feeds against preloaded terrain imagery rather than trusting a single GPS module.
https://dronexl.co/2025/06/10/russian-ai-drone-nvidia-sony-u...
This is ancient tech https://en.wikipedia.org/wiki/TERCOM
It sounds like image matching may be newer. Still you could probably do that with any old satellite image.