The tracker uses GPS (Global Positioning System) technology to calculate its current location. It receives signals from GPS satellites in space. These GPS signals can be received when the device is used outdoors or in a vehicle.
The GPS signal is blocked when the tracker is located inside a building or under a concrete roof. The signal may be blocked or diverted even if the tracker is placed near a window. In such cases the device will use an alternative method to calculate its position. The position is determined through identification of a nearby WiFi router or mobile communications antenna. This is less precise than GPS data, and may be hundreds of meters from the tracker. If the device is using a cell-based location (also known as "GSM-based location"), you will be able to tell by a semi-transparent blue circle over the location.
