If you use AirMail or SailMail you can file position reports generated by
your GPS data automatically. See
http://www.pangolin.co.nz/yotreps/index.php and/or www.SailMail.com

YotReps also has software that will generate correctly formatted reports
via other e-mail systems. I've also written my own tracking software which
utilizes the same log format as YotReps and displays them on google maps as
shown at http://www.geoffschultz.org/Position_Map.php

-- Geoff