Re: ST4000 autohelm to Garmin echo50s
According to the ST4000 manual (Google is your friend),
"Push +10 and -10 degree keys together to select Track Control' from Auto.
Push again to return to automatic steering"
so there's no Track button, but it does have the capability.
On my previous boat I used a Raymarine ST4000 (?) Wheelpilot with a Garmin GPS180, and StandardHorizon NMEA wind instrument, no problems and it supported both Track and Wind modes.
1998 Jeanneau SO45.2