You can absolutely do it. Use a Garmin 296 or 396 during your
flight...download the track into Mapsource software and replay and then
if you want to be really fancy you can plot it on Google earth with
software from this site:

http://www.gpsvisualizer.com/

also check out

http://web.295.ca/gpz550/TrackerGE/

there are some neat samples on both sites