Hello, my older brother who has autism lives with my elderly parents. A few situations have happened recently where he has been misplaced from them in busy areas. My fathers has been really concerned that about it and has been talking about buying a GPS device or a tracker? Any advice? We want something that is easy to use. He's had bracelets with his medical history in and always carries his Epi-pens and such with him but things do tend to get lost or broken. He never wanders off and is always with a member of our family or support.