It was a surprise to me, but the Manual for
Autohelm 3000 indicates it can be controlled by
radio navigation device through a standard
NMEA 0183 plug in attachment.
So save your planned course on your nav
equipment and Auto3000 is supposed to follow the nav
equipment all the way home.
I have not tried this yet since I just read the old manual, throughly for the first time.
Perhaps it will help in some way.