GPS positioning is very accurate, however, it needs open space to function properly.
Under conditions where signal propagation is difficult (e.g. in rooms, under ground garages, tunnels, subways, near tall buildings, in places around radio transmitters, etc.) the device may be less accurate and in extreme cases the GPS signal may drop out completely.
In such a situation, LAMAX Tracking devices are also aided by the signal from the LBS network, i.e. the transmitters of mobile operators or the surrounding Wi-Fi networks.