[ryandrake]

Depending on how populated your current location is, even a fuzzed location can reveal personal information. In a city, 10km is fine, nobody is identified. But if your home is the only one for 10km in any direction, and your fuzzing threshold is 10km, you've identified down to a single home.

[simondotau]

Fuzzing should go to the centre of the nearest town with some minimum population, so long as that town is in the same state/country/timezone.