This is how to enable it on your iPhone or Android.
- Tap menu/overflow button and select Settings -> NMEA Instrument Settings
- Check the box that says "Enable Auto Pilot"
- Either choose the default or change the settings as per your Auto Pilot Docs
- Tap on Save
The next time you use "Goto WayPoint" or "Route Assistance", the application will send NMEA instructions to your Auto Pilot.