I've released Maemo Mapper v0.2.1 to address the "Invalid NMEA input from receiver!" message. I was unaware that some receivers don't output speed or heading (particularly if your receiver is in "static navigation" mode) - you guys are missing out! Anyway, I've changed the code to accept empty values instead of flagging them as invalid data.

I updated the first post in this thread (and the name of the thread) to reflect the new version number and to update the links. Or, you can use these handy links right here:

Device-Installable .DEB File
Source Code