Just wanted to also put in a plug for Condor, with one caveat:

Do _not_ use Condor to soar your local area, or your intended contest
area. At the least you'll find it annoying because of the
inaccuracies. At worst you'll make bad decisions in real life because
you got used to referencing the terrain in Condor and try to apply it
to the real world!

Condor Soaring is awesome for developing general soaring techniques
and (as TA pointed out) working with a PDA/flight-computer. It is NOT
designed to give you ground-reference familiarity.

--Noel