If you save your Basecamp/Mapsource file as a .gpx file (not .gdb),  you can open the .gpx file with excel. You are going to get a few warning messages before the final file will open:

Click yes.

Open as an xml.

Click OK

If you have tracks and routes in the same file, you will get another error message (you can only open waypoint locations, not tracks and routes)

Click OK.

You will now get a spreadsheet with a lot of columns.