Do you carry a cell phone on rides? If you do and it's an iPhone you have a couple of options. I use ibike, it houses the iPhone and "talks" to sensors on the bike (and on me). At the end of the ride It compiles the data, emails it to me, I download the data into my computer where the software gives me analysis of the ride and if I want I get a Google Earth map of the ride too. Very, very simple.