I'm getting some messages on STDERR. I'm using 3.2006.49-2. My GPS works fine. The GPS is a Holux GPSlim 236.

channel_cb_input: Bad checksum in NMEA sentence:
$GPVTG,344.92,T,,M,0.00,N,0$GPGGA,214111.000,4346. 3274,N,07924.0842,W,1,10,0.9,173.8,M,-35.2,M,,0000*65
channel_cb_input: Bad checksum in NMEA sentence:
$GPVTG,344.92,T,,M,0.00,N,0$GPGGA,214116.000,4346. 3276,N,07924.0842,W,1,10,0.9,174.8,M,-35.2,M,,0000*67