Gyro Upgrade for Raymarine Smartpilot S1, S2, S3 or T150, T400 autopilot course computers. NEW, never installed and is the original type used by Raymarine. This is an internal gyro. It attaches to the circuit board and plugs directly into a socket on the board. Fairly easy to install and instructions included. $225.00
A gyro upgrade dramatically improves the performance of your autopilot.