Meet Hi Map: a small GPS tracker that allows you to track your kids, pets, and loved ones on your smartphone or tablet. It is small enough not to make the wearer uncomfortable. With geofencing, you can set virtual boundaries and get notified when your kids cross them.
Hi Map is durable and waterproof. While it works as a tracker, you do have the option to make an emergency call to it when tracking is not available. Hi Map is currently getting funded on Kickstarter.