Does anybody know SCX21 default NMEA0183 HDT baud rates, HDT period, and port locations for baud rates? I don't have GP39 or PC Tool available, I just want to connect it to one older Raymarine pilot.
AP-2 and AP-3 (digital page 42 and 43). The Menu Tree section in the Operator's Manual shows you all of that information for each of the three data ports. Each port is different but "out of the box", all three are NMEA 0183 V4.1 and talker ID GN.