Probably not economically feasible but I don't think technically impossible given analytics from devices. And concidering cell signal is likely covered down th

Probably not economically feasible but I don't think technically impossible given analytics from devices. And concidering cell signal is likely covered down there and the locations of cell towers are almost certainly mapped they could use some sort of triangulation to generate a pretty reasonable map even without having ever been there. As I said, I doubt they would put the money into it... Would be a really fun project to build out if you had access to the data though... Maybe don't want to do it because it would make it more common knowledge about how easy it is to track device location even without GPS... I don't think you would need physical beacons, cell towers or fixed wifi APs[1] will likely be good enough and using some statistics would make removing cases where an AP moved/get renamed / goes down temporarily. 1. Access Points