We've enabled Location Sharing constantly on my Dad's Android phone, and I have the password to log into his Google account. He is obsesses about his phone, so usually takes it with him. He wears various different coats, different hats, sometimes forgets his keys and has a couple of walking sticks, so the phone is pretty much the most reliable thing for us to track. If your person with dementia takes a phone out with them, it can be tracked pretty reliably, even if they don't actually use the phone. If it is in their bag/pocket, then it's useful when Location Sharing. Apple phones have the same capability.