Also - FYI there are devices like this:
that have a ‘Geofence’ you can program an alarm to go off when the person wearing the device has ‘breached’ the limits of the defined area.
There are different products - I got the one that alerts a monitoring team to a possible fall, but there are devices for ‘wanderers’ too.
Not sure if your father would accept to wear it…there are other geo locator options to slip into pockets