Wandering Advice

Hello everyone,
I'm a Industrial Design student currently trying to design a product that could help prevent dangerous wandering in people living with dementia. My grandmother has dementia, and right after moving houses she had a few bad wandering incidents at night that could have ended badly if she hadn't been found by some neighbors. I was hoping for a bit of feedback from caregiving communities for my initial concept.
- A wearable GPS device, perhaps a pendant or a bracelet inspired piece, that could ideally be customizable to reflect some of the patient's personality and interests, connected to a smartphone app that can alert caregivers when someone has left safety zones that can be deemed by the caregiver, either by a discreet message or by an alarm, depending on the time of day and the patients current independence and mobility. Trusted neighbors could be connected to this app with the ability to contact you in case of finding your loved one in a confused state when wandering.
Let me know any concerns, advice or feedback. Would be greatly appreciated.