Phones find kids with GPS

The San Francisco Chronicle reports:

Forget about Big Brother. What about Big Mother?

Sprint introduced a global positioning system service called Family Locator that allows parents to use a mobile phone to track their cell-phone toting children while out and about. Now, harried mothers and fathers can be on their way to work or on an assignment and still know that their child made it to school or soccer practice on time.

For $10 a month, parents will be able to track up to four phones from their handset. The service will give parents an interactive map showing them their child's location, a nearby address, local landmarks and a margin for error. Parents can also access the tracking service on the Internet and receive alerts when their child has reached an expected location. The location service is accurate to within a few yards in an open setting or within 50 to 100 yards when the subject is indoors.

How much longer can it be before many workers are going to be tracked with GPS?