Patent ID: 8150418

Claim:
A method for monitoring a monitored wireless device relative to a monitoring wireless device using a monitoring system having a computer processor, the monitoring wireless device and the monitored wireless device having a relative velocity and a geographic separation, the method comprising: comparing, at the monitoring system, the geographic separation to a geographic separation threshold; determining, at the monitoring system, if a relative-velocity threshold is determined to be dynamic, a first value for a relative-velocity threshold using the geographic separation; determining, at the monitoring system, if the relative-velocity threshold is fixed, a second value for a relative-velocity threshold, including decreasing a previous threshold if the geographic separation is below a certain separation; comparing, at the monitoring system, the relative velocity to the first value if the relative-velocity threshold is dynamic and to the second value if the relative-velocity threshold is fixed; and generating, at the monitoring system, a notification if the geographic separation threshold or a relative-velocity threshold has been breached.