@MarkoG - this may or may not help!
My dad had a short but worrying career as an escapee from the home he is in so I rang him up and told him I was buying him a new watch. He was quite pleased with that and I asked him what kind he'd like - digital or anologue, and he asked for the latter, which is the most expensive (obviously!)
I bought (with his money, to be clear, it was a need recommended by social services) a Doro watch which looks like a normal watch. I also paid extra for the locking strap and that is good because dad would have lost it long ago without that. It calls me if he presses the buttons for too long and would be very helpful for someone without dementia who could learn how to use it. It also is supposed to have a fall alarm but Dad has fallen in his room and no notification, so not sure how that works. I realise I'm not giving a glowing review but it only has to work once or twice to feel it's been worth it. The GPS signal in the home is rubbish so it's not been that good over lockdown, and it requires a £20 a month subscription for the phone/tracking element of the watch.
BUT - when dad broke out of the home alone one morning and got on a bus, the tracking DID work. It did not work when he broke out on foot and didn't get far enough on his own to trigger it (he's not very mobile). I had hoped to stop the subscription but if I even think about it it's like he can tell and he mounts another campaign to wander off!
If you have someone living independently who you need to keep an eye on and goes out regularly it would be very useful.
Other types of trackers I considered:
Insoles - dad has special shoes and I couldn't guarantee which he'd wear, if he'd wear a pair (he's worn two left feet before) or indeed many people can't guarantee a PWD will even wear shoes if they wander off.
A keyring/necklace style tracker - would have been discarded and lost almost immediately.
Really, for my dad, a non-removable watch was the only thing that would work.
The other thing is charging. They all need it. The care home staff take dad's watch off using the key discreetly when he has a bath or shower and charge it and that seems to keep it going enough. Dad would never charge it otherwise.
I get a lot of false calls when he's fiddling with it and accidently holds down the panic button, and I used to answer and talk to him and he seemed completely unsurprised by me talking to him from his wrist like he was James Bond. You don't have to have that feature enabled but I did and it also has auto answer so if he had wandered off I could call him and it would connect immediately, so I could, in theory, help someone else help him, and hear what was going on, if he was able to speak to me etc.