Not only watch specific but I backed a kickstarter project a few years ago for an app/bluetooth dongle called Find my Car Smarter.
There's a tiny USB bluetooth beacon that you plug into your car, paired to your phone so that when you turn off the car and the bluetooth signal disconnects it records your parking position. There's an accompanying watch app that you can open up and it pulls the last position of where you parked. Click the pin and you're offered walking directions via maps.
I'd highly recommend it because it solves the problem of having to remember to mark your cars location after you park before walking away (and then only later realizing you never marked the location you parked)... with this it just happens.