I was looking at Polar's website and going through the different models they have. Mostly the S-series. Anyway, I was reading through the specs on them and do some of them calculate total biking distance?

"Full Functional Cycle Computer/HRM - with hard wired speed, distance, and auto start" -- specs from the S150

Also, how does it keep track of HR when it is mounted on your handlebars? Basically I am not aware of how these things work.

Thanks in advance.