I have had a couple folks ask how to open a GPX file from Mapsource, it's simple. Click on open and then select the file type pull down at the bottom - nothing to it: Some of the Garmin GPS's have a configurable tracklog allowing the user to record points more frequently which makes them real big. If you have a monster that you want to work with or post, simply open it up in Mapsource, right click on the track log and select properties. From there you can click on the filter button to change the sampling of the track: If you have any other questions, post them here. That way it will be easier to search for routes and tracks in the future without all the clutter.