I cannot comment on the original question about XCSoar versus LK8000
and which to use as I have only flown with SeeYou Mobile on the Oudie
(and GlideNav II on a HP PDA).

But, here are links (and links to links) to good descriptions on the
Naviter forum on how to have either tool running on the same Oudie -
which would allow you to have the best of both worlds and to trial
both tools.

http://forum.naviter.com/threads/479...r-on-the-Oudie
http://forum.naviter.com/threads/256...ghlight=xcsoar

Good luck, John