I got hands on a Hemisphere OEM GPS compass board, which gives me GPS based heading even while being stationary. Using NMEA0183 I am able to use this heading in Expedition. Now I would like to compare this heading-source with my two existing compasses (NKE Regatta/H2183 and Nexus HPC). Is there any way to use more than one heading in Expedition? My first idea was to use the satellite based heading as a XDR data and use strip chart to compare. How is your experience with al these satellite compasses (Simrad H70, Hemisphere Vector)?

Second question: Did anybody succeed in getting NMEA compass heading directly out of the NKE Regatta compass, which is basically a rebranded Airmar H2183 with proprietary software?