In fact. Maemo Mapper and Navicore can share the GPS receiver!

I just got back from a short trip as co-pilot and I of coarse took the tablet and GPS. You can run both apps at the same time and this IMHO makes the Navicore navigator on the N800 the best in car navigation solution out there.

With this dual setup you can always have a look ahead view that is always oriented north by simple task switching. This works out well for me because I like to check out what is around my destination while I'm on a boring stretch in route. Navicore continues to give spoken direction while using other apps.
No other car navigator that I know of allows you to view maps from different DB's concurrently. As a bonus I can cut down on the amount of maps MM stores to zoom level 4 or 5 and above.

Maemo Mapper will also give voice direction too. I haven't tried it with a MM route yet but when I shut off the GPS, both Sarah and the flite babe told me the connection was lost.

They talked over each other but Sarah's demeanor made herself heard over Flitey's matter of fact voice.

I'm thinkin' Sarah would be hotter looking too... in a young librarian sort of way.

One fault though... Sarah apparently thinks she is being kept in a cell phone. There are a few phrases used when you arrive at your destination and the program must choose one at random because so far, each time I've heard one it was different... Today i heard Sarah say "Congratulations. You have arrived at your destination and your cell phone thanks you for using Navicore software." or some such.