The Century 21 autopilot in my M20J no longer holds a heading. I am thinking about replacing it with a new or refurbished autopilot rather than attempt to have it fixed only to have it still not work. Any suggestions about what to replace it with? If you have installed one about how much did it cost? The Century 21 is a single axis autopilot. I'm thinking about replacing it with another single axis autopilot because the two axis is so expensive. Do you think I will be disappointed if I only do single axis? Can I easily upgrade later to add the other axis?