How do they have GPS in the sewer? Phones don't track your position with acceleration data
@matrix
You know I thought about that once when I was like 13. How many turns would be needed to narrow down to an acceptable number of possible locations, augmented by where the device was set up and/or last seen?
@r000t
I don't think it matters. If an accelerometer could track a twisty turn precisely enough it could also track which grid lines you took.
Rural might even be more easily trackable simply because there are less places to go
@matrix
I was thinking more like, there's only so many places that have these three turns this length apart and they're this extreme
Works less in places with perfect grids, probably works better in suburban developments which are intentionally twisty