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Making a Child Locating System
celtic_hackr writes "Well, I never thought I'd be an advocate for placing GPS devices on people. However, since it took less than three days for my local school district to misplace my daughter, I have decided that something needs to be done. By the school district's own admission it has a recurring problem of placing children on the wrong buses. Fortunately, my daughter was located, with no thanks to the local school district. Therefore, I would like input on a way to be able to keep track of my child. I know there are personal tracking devices out there. I have nothing against these systems. But I want more than this. My specification are: 1) a small unobtrusive device I can place on my daughter, 2) an application to pull up on any computer, a map with a dot indicating the real-time position of my child, 3) a handheld device with the equivalent information, 4) [optional] a secure web application/plug-in I can install on my own domain allowing me to track her from anyplace in the world, 5) a means of turning it all off, 6) a Linux based solution of the above. I believe all the pieces for making such a system are out there. Has anyone built anything like this? Is there an open source solution? How would I go about building my own? Has anyone hacked any of these personal trackers before, to serve their own purposes? How does a tinfoil hat wearer engineer such a device to make sure Big-Brother isn't watching too? Can these devices be locked down so only certain devices can pick up the GPS location of an individual locator? What other recommendations do you have?"
Was this supposed to be some sort of abstract attempt at humor? Your GPS device does not send data back to the satellites. It's just a passive receiver. It doesn't matter one bit how many other people have GPSes. Might as well claim you're getting poor FM radio reception due to too many people listening to their stereos.
You would have had a point if you talked about your MOBILE not getting a signal or something due to devices that use that network had you said that.
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I am not sure whether tracking your child is a good idea or not.
I don't tell other people how to raise their children.
If you wish to buy a tracker in a phone, here is some information.
Good Housekeeping expressed opinions
http://www.goodhousekeeping.com/product-testing/reviews-tests/appliances-electronics/kid-cell-phones-0306
loc8u ofers a GPS Watch
http://www.switched.com/2009/01/07/lok8u-launches-gps-child-locator-watch-at-ces/
Wherify has one
http://www.theinternetpatrol.com/wherify-wherifone-cell-phone-with-gps-locator-lets-you-gps-track-your-kids/
AT&T has one
http://www.gpsbusinessnews.com/AT-T-launches-child-locator-service_a1470.html
Here is a discussion of short and long range child locators
http://www.gpsfortoday.com/child-locators/
Amber Alert has one
http://www.gpschildtracker.net/child-gps-devices-systems-tracking-phone-chip-child-location
However, if you don't want to use a phone
and build more of it yourself,
here are some websites that may be useful:
http://www.tradekey.com/selloffer_view/id/2924121.htm
http://www.brickhousesecurity.com/gps-tracking-server.html
http://forums.coolest-gadgets.com/showthread.php?t=4079
http://www.ecplaza.net/search/0s1nf20sell/gps_tracker_%20gps_tracking_gps.html
http://5thirtyone.com/archives/876/comment-page-1