[masraum]

I've got a phone that could do the same as a computer (except that the screen would be harder to see in bright light, and the battery would get sucked down with the screen and GPS running constantly). I've got a watch that could also do it including telling me my heart rate. Ditto on the battery life. I've also got a chest strap HRM that will work without the phone or watch or can work in real time with them. (without, I can download my data once I get back to the phone).

For shorter training rides, I suspect any of those would do.