Do you have to do anything with the app on your phone before you set off? Does your phone need to 'see' the sky, or can it be in a bag? Do you need GPS on whilst using app? Should I just check the app FAQ's on the website?
when you can get that bike commute done without nearly hurling your guts out either end you can get into "apps"
when you can get that bike commute done without nearly hurling your guts out either end you can get into "apps"