Sis was diagnosed earlier this year. She wants to attend an event which means a lot to her, 3 separate days over next month or so, and I promised I would take her. It's at our state fairgrounds - fairly large area. She does fairly well getting around and not lost, likely because I'm always within sight when I take her shopping. What I'm hoping to find is some gadget - perhaps an app on a phone - that would locate her if she happens to wander off or be disoriented. I'd like for her to have some freedom to 'visit' with friends without me appearing to be sticking like glue. I use an iPhone (iOS platform) but she has an Android mobile phone and I don't think such an app, if it exists, would work cross-platform. If she should get lost or disoriented, she could always call me but I'm looking for the invisible type monitoring where I'll know where she is. Somewhat like the map app with the blue dot that shows where you are...in this case it would show where she is...maybe. Thoughts?