Five years later, I'm still having the problem described in this thread. I have a Garmin 152 GPS, I'm running OpenCPN ver. 5.5, and can't upload waypoints using NMEA. It looks good going out, but no waypoints are received at the other end:
12:36:18 PM: Opening NMEA Datastream
Serial:COM3
12:36:19 PM: -->GPS Port:Serial:COM3 Sentence: $ECWPL,3751.632,N,12229.017,W,001*72
12:36:19 PM: -->GPS Port:Serial:COM3 Sentence: $ECWPL,3751.705,N,12228.875,W,002*79
12:36:19 PM: -->GPS Port:Serial:COM3 Sentence: $ECWPL,3751.431,N,12228.202,W,003*76
12:36:19 PM: -->GPS Port:Serial:COM3 Sentence: $ECWPL,3751.638,N,12227.161,W,004*73
12:36:19 PM: -->GPS Port:Serial:COM3 Sentence: $ECWPL,3752.321,N,12227.323,W,005*78
12:36:20 PM: -->GPS Port:Serial:COM3 Sentence: $ECRTE,3,1,c,Temp,001,002*0B
12:36:20 PM: -->GPS Port:Serial:COM3 Sentence: $ECRTE,3,2,c,Temp,003,004*0C
12:36:20 PM: -->GPS Port:Serial:COM3 Sentence: $ECRTE,3,3,c,Temp,005*13
12:36:20 PM: Closing NMEA Datastream
Serial:COM3
This used to work in my prior version of O (I forget the version number and don't have it anymore). Did the fix described in this thread not make it into ver. 5.5?