gnuite:
When I record tracks on my handheld Garmin, I have the option of recording track points at equal time intervals or equal distance intervals or a magic in-between formula. The equal distance intervals option would be handy on the n800 if I wanted to create a road map by driving around (which I do).

I didn't actually check the n800 gpx track files before I posted my question. I can now see that the track points are recorded every second. This is frequent enough that I can probably create a derived track file with points at equal distance intervals using gpsbabel.

Is the one second between track points a fixed interval, or can it be changed?