This sort of thing.
http://www.magellangps.com/Store/Switch-Series/SwitchUp-GPS-Watch
I'd stick with the cheaper and more well known Garmin, even if they do suck. The 310 watch seems to do power. That might be useful if I could have it rotated so it's visible most of the time while I'm on aero bars.
@hippy started
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This sort of thing.
http://www.magellangps.com/Store/Switch-Series/SwitchUp-GPS-Watch