GPX overlay - try it out.
Be sure to capture your tracks from your pre-run. Also, drop waypoints in your gps as needed along the way.
The GPX track and WP overlay feature is a huge help when making corrections after a pre run.
You can also export the GPS tracks from Navigator to your Gps to lay out your pre-run. It will export directly into the MapSource software.
We will be adding a filter to automatically filter your track to 500 track points (the max a Garmin gpsmap60 will handle)
Let us know how it works out.