I know this is fairly old post but wondering you you ever got this to work properly. I am in a similar position with the same AP and thinking about Vulcan MFD so that I have the sailing info they provide.I was able to verify that my Chartplotter and MFD were sending values in XTE, DTW, and BTW. But, when I used the STANDBY button on my ST6002 Pilot Controller, the controller displayed "---" indicating that no data was received. So, at this point I boxed up the SPX5 and sent it off to Raymarine Support to perform the software upgrade. Like I previously noted, I have doubts that the upgrade will help with this connectivity issue, but it can't hurt to have it on the most current software release going forward.