Have not done it but have considered it. You need the Tacktick NMEA box and apparently an NMEA to Seatalk bridge. If i recollect right he ST1000+ cannot read wind date from NMEA it has to be seatalk...but i could be wrong too..
the manual of the st1000 says it can take wind seatalk in and nmea in
but it does not say it can take wind nmea in
i do have an nmea interface box for the speed from the garmin gps which displays on the tacktick and gives depth from a non tacktick transducer to the gps plotter !
i have e mailed tacktick for the autohelm question