Apparatus and method for determining location and tracking coordinates of a tracking device

A method to control power usage comprising:

• measuring a receive communication signal level by primary location tracking circuitry of an electronic tracking device communicated by a primary location tracking system;
• adjusting applied power levels to the primary location tracking circuitry and supplemental location tracking circuitry in response to measurement of a receive communication signal level relative to a predetermined signal level;
• determining differential positional measurements based in part on acceleration measurements of supplemental location tracking circuitry associated with a secondary location tracking system;
• and
• determining positional coordinates of electronic tracking device responsive to a known reference coordinate values and the differential positional measurements.

A portable electronic tracking device to monitor location coordinates of one or more individuals and objects, the device comprising:

• primary location tracking circuitry to measure a receive communication signal level communicated by a primary location tracking system and received by the electronic tracking device;
• supplemental location tracking circuitry to determine positional measurements based in part on measurements associated with a secondary location tracking system;
• and
• a battery power monitor configured to:
• reduce applied power level to the primary location tracking circuitry in response to measurement of a receive communication signal level less than a first signal level;
• and
• increase applied power level to supplemental location tracking circuitry response to measurement of the receive communication signal less than the first signal level;
• wherein the electronic tracking device is configured to determine positional coordinates responsive to a known reference coordinate values and the differential positional measurements.