have you ever played pokemon go. Pretty accurate.

I used a crappy GIS website that connected to my phone's gps and it showed me, by the step, where a property line in a woods was.

it's GPS, same as the military. The consumer is limited to less accuracy than military hardware but it's very good.

Perhaps it might need people to be, oh, I don't know, 6 feet apart to guarantee proper identification.

If you're trying to locate a phone using cell tower triangulation that's not accurate at all.