TrekBuddy highly usable and small size of data On-Board-Navi, you need to load your route, maps and atlas by hand to your mobile

Chemist's Europe Atlas 0.2.0

Chemist's D-CH-A-B-NL-SK Street Atlas 0.1.0

Chemist's D-CH-A-B-NL-SK Street Atlas 0.2.0 (terrain)

Chemist's Pfalz Atlas 0.1.0 (thats all I need everything else is too far in the forest)

TrekBuddy (GPS and Map Tool for JAVA enabled mobilephones)

GMaps2.0 to TrekBuddy (online-converter for GMaps)

GMap2GPX (extractor for routes from GMap to GPX