MC - did you see these? http://www.myfilip.com/
thats interesting but i wonder if it would stay on them, my daughter lost her prized watch an hour after she opened it playing outside
my husband wants to put a tracking device on my daughter, unbeknownst to her, when we go places that she could be kidnapped (like the fair or mall)
We use this app called "find my phone" for tracking each other.
It is great for finding lost and stolen phones and has saved ours many times.
It is also great for locating off spring (and their parents).
At any time I can see exactly where my kids are (Scotland, Los Angeles, high school) and if they are homesick or want to know how near you are to picking them up for example, they can just check you out.
Down side is when DH sees me in a strange place (like picking up fertile eggs) and wants to know what I am doing there

Bit like a Mauderers map as in Harry potter.
Overall down side is worth the upside. We call it the creeper app"
Here are my kids locations 2 minutes ago: