I’ve checked the NMEA sentences received in Open CPN. It seems to be OK. So, the problem seems to be in Dash Board.
I’ve connected a VHF antenna and AIS works well .

But my QK-A027 cannot send information to my GARMIN GPSMAP 722. I’ve connected MNEA OUT(+) to RXA and NMEA OUT(-) to RXB
Do I need to buy a QK AS03 ?

Thank you.