Altitude Offset 0 and offset 1 works well - nice feature
Dealing with our silly USA units appears not to be working ~ at least here in altitude - It is showing alt @ 1468 which is fine for meters ~ but should be ~ 4581 feet
I'm not sure why you say, "But there is also included some GPS-config that will set MKT-GPS to 5 hz and the necessary NMEA-strings."
At least what I see (only altitude) things seem to be working when I set BAUD to 38400. I would think if altitude is good so is lat long? Maybe you could toggle lat long (small font below alt) then I would know for sure