I just received this and when looking at the items on the Firmware2.1 that are to be correceted there is mention of working while being powered. Likley buying mine today or tomorrow!
You may need to download a software update to your Edge 800. Here is how to do this:
Connect your Edge 800 to the computer
Run Webupdater...if you do not have this on your computer here is a link to download the program:
http://www8.garmin.com/support/colle...t=999-99999-27
When download is complete disconnect Edge 800 from the Computer
Power on the 800 to allow the software time to finish installing into the Edge.
Please reply for further assistance.