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I will give you an example situation to understand: While GPS should be quite accurate (bad conditions might give lower accuracy, but usually shouldn't place you too far off), and cell towers usually are not moving - WiFi hotspots may exactly do that. Google's location service makes use of different identifiers: That's most likely not a GPS position, but rather a WiFi hotspot. The picture above shows an inaccurate fix that covers 3 villages, and a number of roads (I was actually on a train at the far southern edge of that blue circle).Īs long the problem location fix has a large blue circle around it, and you can account for being somewhere in that blue circle then you should be ok. When you click the blue dot for a location, Google draws a blue circle around it that shows approximately the (in)accuracy of that location fix. If you visit the Location History page in your Google account on a PC, at then it should show a similar map and listing of places as you see on your phone, but you can also click each recorded location to see how (in)accurate it was. So if you didn't have Google Maps open for any reason at the time of the erroneous location, it will have defaulted to it's least accurate location finding service, that depending on the density of cell towers in that area (generally more dense in urban areas, less dense out in the countryside) could be out by several kilometers. Note: When Latitude is running in the background, it will default toĬell ID (cell tower) location on most phones to preserve your battery Note: Some devices do not support cell ID location. Phone must support WiFi and have it enabled.Ĭell ID: Cell ID (cell tower) accuracy depends on cell tower density and available data in Google's cell ID (cell tower) location database.Īccuracy may be approximated at distances up to several thousand

WiFi: WiFi (wireless network) accuracy should be similar to the access range of a typical WiFi router, or about 200m or better. Your phone must support GPS, have it enabled, GPS: GPS accuracy can be up to several meters depending on your GPS signal and connection. The following location data sources may be used to derive location:

From Google's Location Source and Accuracy page: