It's entirely possible he knows he's being tracked and might be perfectly fine with it. I've heard of people using GPS tracking apps to track down grandparents

It's entirely possible he knows he's being tracked and might be perfectly fine with it. I've heard of people using GPS tracking apps to track down grandparents with dementia or other health issues, as well as recovering addicts in case they don't come home when expected or answer the phone after some period and all of that was consentual because they agreed it would only be used in the case of an emergency. This might be something like that.