Thanks for the reply. Yes, the symlink was added and is pointing /usr/share/roadmap to /drive0/roadmap. Not sure how to register the large font or even if it matters? Roadmapgpsapp is functioning, just no map overlap. Played with menu items, like Toggle Map and switched b/w Text/Map/Sats screens, but no roadmap. Also, increased reservecache from 32 to 64, didn't help. Re-downloaded all roadmapgpsapp files to empeg, no change. All roadmap data files expanded properly in /drive0/roadmap.
preferences:
General.Database: /drive0/roadmap,/usr/share/roadmap

Not sure where to look next?