Why is my GPS sports watch not working?

As you said that you want to know that how your GPS sports watch not working, so firstly I want to tell you that touch bezel lets change screens with a simple tap and no more fumbling for buttons, and training features that continuously monitors your time, distance, pace, heart rate and calories (when paired with heart rate monitor, and the third ANT+ sport wire less platform wirelessly sends your data to your computer and the last download recorded courses to compete against previous workouts. And I guess this is a technical fault and for this problem you have to contact to the your nearet service center and they will tell you the exact problem about the product and also resolve this problem. I guess my this information helps you.