The S3 autopilot: Are you referring to the computer or ?
Yes. The system includes the course computer, the fluxgate, and rudder sensor. A drive unit isn't included (different boats req different ones). The S3 will work with any of the Raymarine drive units though.
Since you said S3 and not S3G, Can you confirm that it is the non-gyro unit.
I don't think it's the S3G unit. It says S3 on the front. The system came w/ the (used) boat. It has a hookup for a gyro so maybe that means it's not a S3G? I assume it's built into the unit on the S3G.