| 摘要 |
A method for a user to monitor the location of a subject is disclosed. The method includes defining a timetable of allowable location vectors for the subject via a central control computer, specifying a phone number associated with the user, and transferring the timetable of allowable location vectors to a control module of a cellular telephone. The method continues with monitoring the current location via a global positioning device within the cellular telephone, comparing a combination of current location and time to the timetable of allowable location vectors; and determining if the combination of current location and time satisfy the timetable of allowable location vectors. In response to determining that the combination of current location and time violate the timetable of allowable location vectors, contacting the central control computer; and establishing a communication link, via the central control computer, between the cellular telephone and the specified phone number.
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