I unpacked it where directed, and it worked fine.
It even found my onboard GPS, although nothing locked, as per usual.
I added my state map, and that worked, as well.
I searched my address, and flite announced when it found it.

Then I found usr/roadmap/preferences and added a line
unpacked a bunch of stuff over there, and renamed the original map directory.
That got me a blank stare from Roadmap.
Fires up, no streets. Zoom in and out, search for address, nothing.
Noting the maps symbolic link to /media/mmc1/roadmaps,
I named the original directory back, but roadmap is still not talking to me.

Uninstalled and reinstalled, it's working with the original directory.
I haven't got room there for much, though.
I guess it's time to learn about symbolic links, point it where I want it to go.