Seems like false sense of security. It only updates every 10 minutes or so. If you are really worried have them just call you and put their phone in their pocket. That way you can listen in and call 911 if needed.
Waiting 10 minutes for a GPS update doesn't seem to actually increase safety in any noticeable way.
Waiting 10 minutes for a GPS update doesn't seem to actually increase safety in any noticeable way.