A GPS tracking unit is a device that uses the Global Positioning System to determine
the precise location of a vehicle, person and other asset to which it is attached
and to record the position of the asset at regular intervals. The recorded location
data can be stored within the tracking unit, or it may be transmitted to a central
location data base, or internet-connected computer, using a cellular (GPRS or SMS),
radio, or satellite modem embedded in the unit.