PCQ feel free to try my build of roadmap at http://maemobox.org/dblank/roadmap_1.1.0-1_armel.deb

There were some things I was planning on doing before sharing a .deb, but I forgot what they were

I don't know about the N810, but I had to run /usr/libexec/navicore-gpsd-helper and then have roadmap use gpsd to get it working on my N800.

Edit: you may want to edit /usr/local/bin/roadmap.sh, and add "sleep 10;" (without quotes) after the &, it takes my GPS at least a few seconds before it starts spitting out data. Also set --maps to wherever your maps are.