I've been using the route logging on my F90 to keep logs of some of the driving trips I take. Example:

 

http://www.everytrail.com/view_trip.php?trip_id=78261

 

 

The only complaint that I have is that the F90 doesn't log the altitude along with the lat/long coordinates. Does anyone know of a config file or hack available to enable altitude logging? Most other GPSs support this out of the box.