I guess this is as good a thread as any to report that the internal GPS receiver on the N810 works with Maemo Mapper. I don't find the accuracy to be all that good, but it's better than nothing.

To use the internal GPS receiver with Maemo Mapper, be sure to use the "Bluetooth" option on the GPS tab of the Settings dialog. You must leave the corresponding text field blank. (Leaving the field blank causes Maemo to search for all GPS-enabled devices, both internal and via Bluetooth.)