and you will have to get the card renewed after every 3, 5 or 7 years...
there is already a nation wide telecom network, the chip can be designed to use it.
now you know a certain perimeter within which the chip is located. using this information, you can bring in 2 radio teams which will track the chip from different locations within the perimeter. using these two distances, you can calculate the exact location of the chip relative to the location of the two radios.
Also, please note that we are just talking theoretical stuff. we are just considering if it is even possible, not if it is really the case.
And I don't really think it is the case. The government doesn't need such a tracking system. traditional intelligence works more efficiently.
But im not an engineer my self so....I dont really know for sure if its actually possible.
If there is an engineer here, he should give us a figure of how long a battery weighing less than 5grams can run a transmitter that transmits a signal every 30 mins with a range of 25km.