Siri, remember where I parked my car
If you have neither - and I have neither - you just have to say to Siri, "Remember where I parked my car." And she does.
Yup. I just found my favorite feature of iOS 10 (the public beta, in this case.)
No more wandering around football-field sized airport parking lots at 12:30 am after a 6-hour flight trying to remember where I parked my car. Sweet!