offline / offboard GPS navigation

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Has someone offline / offboard GPS navigation working? Which app?

Google Maps Navigation is not bad, but it needs an online connection, which is bad. I have an unlimited data plan, but GPS + 3G running at the same time drains a lot of battery, which is small and weak anyway. Therefore I am looking for an offline navigation software.

CoPilot it tells me that I do not have enough space, but I cleared my internal storage, 52 MB available, should be sufficient. Still doesn't work, it's also not listed in the list of compatible phones.

Navigion looks quite promising but to get it installed it seams I need a sd-card bigger then 2 GB, I guess like 4 GB.

Did you get some of these working?

I use Navigon Mobile Navigator ver. 3.6.1 and i´m very satisfied with it. the maps were stored on the sd card!
sigic aura also works...