A tracking system includes a central monitoring location, a tracking device, and a first tracking application. The first tracking application operates on a cellular device, the cellular device also having a second tracking application. The tracking device is lockably attachable to a limb of monitored person. The tracking device has first electronic hardware that provides health and status information about the tracking device to the first tracking application when in range, and second electronic hardware that is detectable by the second tracking application operating on the cellular device when in range, for which the second tracking application can determine relative location information about the tracking device relative to the cellular device and transmit the relative location information to an independent tracking database. The absolute and relative location information can be combined to provide a more accurate location of the monitored person.