[Alupis]

From your link:

> For example, the government commits to broadcasting the GPS signal in space with a global average user range error (URE) of ≤7.8 m (25.6 ft.), with 95% probability. Actual performance exceeds the specification. On May 11, 2016, the global average URE was ≤0.715 m (2.3 ft.), 95% of the time

Which assumes clear skies and good line of sight... Neither condition exist inside your pocket or house.

Regardless, none of the technologies you listed are accurate enough for police to legally search a person or their home simply because some tech company says a device is located around some dot on a screen.

PS: Your warehouse tracking thing is interesting, although I think you'd of had an easier time tracking gyroscope/accelerometer senor data.

[ViViDboarder]

From your quote:

> Actual performance exceeds the specification. On May 11, 2016, the global average URE was ≤0.715 m (2.3 ft.), 95% of the time

[Alupis]

Did you read nothing else? That is the best possible case, as measured by someone's particular device under ideal conditions - which simply do not exist for a cell phone or a device in a pocket, backpack, or house.

Civilian grade gps receivers often do not have large antenna, can track only a few active satellites at once (often only processing 3-4 satellites even if they are aware of 20 or more) and only receive a single frequency of signals instead of both available frequencies. You want your device to be thin, right?

All this means your stolen cell phone, in someone's pocket inside of a building is going to have horrible resolution, unless it augments it's position data with other sources such as realtime cell tower triangulation or is in a really dense, previously observed wifi area... which are things not available to these tracker devices.