Tangentially related..
I managed to get Google to add my home address to Maps (no idea why it wasn't there). As a consequence I was then able to set my home address in the car to my house and enable Sentry mode. Before that was done I could only choose a house either side about 1/4 mile up the road.
After enabling Sentry mode, I selected "Exclude Home", naturally assuming - as one might - that it would not start using Sentry mode until I drove somewhere. After a while I checked the app out of curiosity and it said "Sentry Mode Active", and was clearly already awake.
Is there some trick to the car correctly identifying the Home address and excluding it? Do I have to drive somewhere before it will realise that it already is at "Home" ?