Longer-range "smart tags" use 'active' RFID -where a radio transmitter is powered by a battery and can transmit up to 2000 meters (6,600 feet) in optimum conditions.
RFID-based Asset Tracking requires an infrastructure to be put in place before the whereabouts of tags may be ascertained.
Unlike traditional barcode labels, RFID tags can be read faster and have higher durability.
The frequency with which the position of the device must be known or available dictates the quality, size or type of GPS asset tracker required.
For example, Find My iPhone is an app and service provided by Apple; it was used in rescuing a missing person in deep ravine from a car accident[3] after other attempts failed.