DVB-T USB dongle in Openplotter

[Przemek]

Hi, I build simple, cheap navigation on Raspberry Pi3b+ and Openplotter. I buy cheap DVB-T-DAB-FM USB Reciver (RTL2832U / RTL2838UHIDIR). I enable serial ports in raspi-config and add new connection on Connections tab in Opencpn GUI settings. I also see device in "Serial" App in apps menu. I go to /usr/bin and start rtl_test and everything was OK. I find that tutorial to calibrate SDR reciver but I can't find it in my Openplotter installation. Can somebody help me to make it work? What step do I have to make to auto recive data when I turn on Raspberry on boat?
Regards Przemek.