I've heard and read that a new generation of satelite based location finding devices will include "child finders" and related products. The kid's pin induces it's location and sends that info via RF to the parent's device. Great for locating them in a mall, I suppose.

I don't have any kids (yet) so I'm more focused on just the house knowing where I or my wife is for the sake of entertaining us. I'd rather NOT have to depend on us carrying anything. Still pondering.

Dave