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I am seeking advice regarding the poor functioning of my autopilot system. I have a Raytheon 100 course computer mated to a Raypilot 650 and Garmin 7610 and 741xs via NMEA0183.

The autopilot holds a course well and it also turns the boat with decent precision when using it just for that purpose. This issue I am having is when I use my chart plotter for navigation. When I want to have the autopilot follow the plotted solution, it will initially steer the boat in the general direction of the first waypoint, but that is about it. It will over/undershoot the track and basically just keep going more or less toward the waypoint. Given enough time distance it will usually come within 1000' or so of the desired waypoint. Naturally, this is completely useless for multi-waypoint navigation.

I also have an ST6002 AP control unit that I have tried with no success.

Is this a NMEA settings issue? Thoughts and expertise would be greatly appreciated.