Yes. If you have the right lead, Navbox Proplan will allow you to download and upload data between GPS and computer.
I often produce my Plog on Navbox, including adding in any waypoints of my own. When I 'm happy with it on-screen, with all the charting shown, I print the plot and upload it to the GPS. That way, they all match.
After the trip, I sometimes download the track from the GPS to see how bad my navigation was.