I'm back at this again after a short break. We are getting the data to the VX2 through an Actisense multiplexer, everything connected on the system shows good data being received. The VX2 is getting good data from an LS6000 through the multiplexer but nothing from the Icom. I sent an email to Actisense, they do not output NMEA V3, plus, they also said that the DSC sentence from the Icom, which is V3, is the same as V2, and should pass through the multiplexor ok.
I'm still scratching my head on this one.