What kind of workout were you planning on doing that needed a GPS? Normally you'd choose "running" or "biking" for anything involving travel.
I did the guided workout "Couch to 5K in 14 days" earlier this summer. The only stats tracked in the dashboard for those workouts were heart rate and calories burned. The details in the dashboard just breaks down how many calories, avg. heart rate, and duration of each stage of the workout. I was expecting distance to be tracked since it was a running workout, but it didn't even estimate distance based on steps, which could have been a secondary option without the GPS.
I ran a half marathon in the spring and will soon start training for a full marathon next spring. I started my previous training before I got the Band and used the Adidas MiCoach app to coach me through my training schedule. After I started using the Band, I just tracked my runs with the Band, but continued using the MiCoach app for coaching. It'd be nice if the Band could both track the run and coach at the same time.