On a recent ride, I apparently started the timer on my Garmin 800 several nights before while still connected to my computer. The result is a 97 hour-long trip. Does anyone know of a way to edit that data to remove the approximately 94 hours of inactivity that precedes the actual ride?

I believe there is an extremely complicated way to do it, by editing the data file.

https://forums.garmin.com/showthread.php?t=13006

You're just trying to artificially boost your average speed aren't you?





PS: If you're successful, tell me how you do it.

I kinda figured that much and tried editing the file with a text/html editor... but Garmin Connect won't let me upload the modified document.... clearly I'm missing something there. :/

Downloading one of those apps as I type this. But at a rate of 1.5KB/sec, it'll probably be faster to just repeat the same exact ride.

Garmin already makes this very easy. From the activity detail click on the pencil to the right of the Summary. Then just type in your desired distance, average speed, average power, etc. into the appropriate fields.