Biotelemetry is the remote monitoring, recording, and measuring of a living organism's physiological functions, for example heart rate, muscle activity, and body temperature, using communications such as radio waves, sonar, or radar. More advanced biotelemetry systems can monitor behavior in the animal also.
While biotelemetry has been used for decades to monitor wildlife, the US military has been developing equipment used for the tracking of soldiers on the battlefield. According to Dr. Carl Sanders, developer of the Intelligence Manned Interface biochip, this technology was used during the Gulf War to track military personnel.