Not the person you are replying to, but I find it vastly more convenient to not pull out my phone all the time to check the directions to make sure I am on the right track. It feels about as frictionless and simple as checking an analog watch for time.

For those running, I can see it being useful as well. GPS for tracking the morning run, with zero need to carry your heavy phone with you. And (talking about apple watch specifically, as that’s the one I have experience with), you can even connect your wireless headphones directly and listen to music too without needing a phone.