Hello
I have downloaded Endomondo for my phone, its on Android, and its brilliant, tracks how far you have walked, how long it took you and how many calories you have used. It is free or you can pay less than £2 for the pro edition, I love it. Plus you can add your facebook account and it uploads all your walks to it.
It also can be used for jogging, running, cycling
And seeing as most people carry their phone with them most of the time, better than having another item to look after!