Editing GPX or TCX Files
 

Last night I jumped on my rollers and started my Garmin 705. When I stopped riding an hour later, I forgot to stop the Garmin. Consequently, the Garmin recorded about 17 minutes of inactivity. Is there a utility out there with which I could remove those 17 minutes?

I think garmin connect will let you split a ride and then you can just delete the part you don't want. I did it when I first got my garmin but I can't remember how I did it. Maybe it was garmin training center or strava though... it was definitely one of those three things. :)

GPX and TCX files are just text. You can edit them with any text editor.

GPX files consist primarily of trackpoints, enclosed within <trkpt> and </trkpt> tags. Each trkpt element has a lat(itude) & lon(gitude) attribute, and a time(stamp) sub-element (as well as possibly an ele[vation] sub-element).

TCK files have trackpoints enclosed by <Trackpoint> and </Trackpoint>. Each of these has a <Time> sub-element.

In both cases, timestamps are in 24-hour Zulu (aka GMT) time, so you'll have to apply an appropriate offset in hours for your local time zone; e.g., subtract 9 for Pacific Standard Time.

Yikes! I took a look at the TCX file! I'm going to need some time to unravel that! Perhaps it was the editor I was using, but it would be nice if each trackpoint showed up on a separate line!

Anyway, I'm also interested in seeing whether the trackpoints my device records includes elevation data.