Asset Tracker's GPS Lat and Lon

How inaccurate is the Asset Tracker’s GPS Lat and Lon that Electron uploads to cloud?

I made an iPhone app that shows a pin on a map each time it reads the GPS from the cloud, updated every minute by the Asset Tracker Electron.

Is the lat and Lon ‘slop’ a known variance, or should I heuristically measure this, and hard code the variance?