Series 1 and running app

I just got a series 1 and learned that the workout app for running is way off. When I ran 2 miles, it shows 3.5 and 6 miles showed 8.5 miles, so the pace was totally wrong too.

I tried to use Runkeeper but it did the same thing. If I want to use a running app, is series 1 a totally a wrong one? Is there any way I can use series 1 alone and get accurate distance?