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The digram illustrates how an electronic tracking device can track a person by using a machine to locate missing people. There are 3 basic stages in the process.

The first stage in the tracking process is to hide the device in an appropriate place such as a backpack. The location of the device can be tracked by satellite.

A message transmits from the device to a satellite. It is received and then re-transmitted as a text message to a transmission tower indicating exactly where the person is. His or her location can also be picked up on a mobile phone. The device is able to provide details such as the name of the location or pinpoint a specific place on a internet website.

The tracking device provide more convenience and is helpful in our life. This is because it is user-friendly and easily shows the location of the missing people.