Using the Motorola iO200 iDEN modem, the Cyber Tracker is the first GPS device to provide multiplexing on an iDEN network. The Motorola iO200 is an embedded module providing circuit/packet data connectivity, interconnect, and dispatch calls. At only 2 in. by 2 in. square, the Motorola iO200 is smaller than other iDEN data devices, which require mounting with an external power source. Modems to date have not allowed voice conversations to be placed while running a data application. Traditionally when someone is trying to reach an individual running a data application they receive a message "user busy in data." With the Cyber Tracker, the data transmission will be put on hold to allow the voice conversation to take place. Once the conversation has ended, the unit will send the stored data and resume normal operation.