I have a first gen Apple Watch, paired to my iPhone 7. The other day, I did my first 'Outdoor Walk' on my watch. I actually do a walk every day, to and from work, but never thought to actually use the 'Outdoor Walk' feature to track my walks!! Later on, when I then looked at the Activity app, and looked at my Outdoor Walk, I was amazed that there was a little map, whereby the actual route I had walked, was highlighted on the map!!! I can only assume that it was my iPhone 7, tracking where I was walking.....?!!!