A:AnswerThe watch uses 'connected GPS' which means it needs to connect to your phone and use the GPS data from the phone.
Unless you want to carry your phone on all your runs, you won't get GPS data.
Also, the watch has difficulty connecting reliably to the phone.
A:AnswerThe versa uses your phones GPS to track runs and bike rides and such, so as long as you have your phone on you while using the versa, and have the location setting turned on you can track your runs. I am not sure about an independent GPS system.
A:AnswerSorry it has taken me so long to get back to you. It works well with my iPhone X and my Samsung Galaxy 9. If the 5s is up to date on ios, I think it should. When I got the Versa, the package said iPhone 6s and up. Maybe contact FitBit support, they should be able to be more help.