I have a daughter that doesn’t verbalize with disabilities. I use AngelSense. They have different packages. She uses one the size of a flip phone. It costs, but in my case, it is well worth it. Updates every 10 sec. and shows the speed she is traveling on a map. You can set boundaries, tells when she leaves a place or enters a place. I can listen in on her or talk with her. Today she left us in a crowded hotel at a special Olympics event. With one hit of the button it points towards where she is and how far. $33 US. a month with a year subscription.