[Otter]

Depending on who "someone" is makes a big difference. If it's your cell phone provider or these days they guys who control the communcations of your cell phone network (think outsources providers like TING) then they will be able to track you down to within a about a hundred yards of your location in a metropolitian area through triangulation of cell phone towers.

This technology was abailable long before cell phones by the way.

If it's someone like a mod on CP that can only see your IP address then no, they're lucky if they can track your location down to a 50 or 100 mile raidus of your true location. As far as your apps and location finder they do user more sophisticated methods than a simple IP lookup so yes they'll be able to pinpoint about the same as your cell phone provider.

I'm not quiet the hard core techie I once was but I'm pretty sure this is still the rule of thumb.