Can someone please explain to me how to open map files that I have already downloaded, for viewing when I'm offline? Last night I was downloading topos from Terraserver. I can find some map files in Documents/Maps, all of which end in .db, but I can't seem to open any of them for viewing when offline.

I've only had my n800 (OS2008) for about a week. I'm completely new to linux. I'm enjoying the journey, but the learning curve is steep at times.

Thanks