John Barry The large rectangular AP 28 autopilot control head has a knob for course changes, while the smaller square AP24 autopilot control head uses push buttons for course changes. The larger AP 28 also has a larger display size allowing for better, bigger displays. Both have the same functionality. <img src='https://static.shopify.com/s/files/1/0010/3452/files/AP24.jpg?1249782524' alt='' /> <img src='https://static.shopify.com/s/files/1/0010/3452/files/AP28.jpg?1249790210' alt='' /> <p>The large rectangular AP 28 autopilot control head has a knob for course changes, while the smaller square AP24 autopilot control head uses push buttons for course changes. The larger AP 28 also has a larger display size allowing for better, bigger displays. Both have the same functionality.<br /> <img src='https://static.shopify.com/s/files/1/0010/3452/files/AP24.jpg?1249782524' alt='' /></p> <p><img src='https://static.shopify.com/s/files/1/0010/3452/files/AP28.jpg?1249790210' alt='' /></p> 2009-08-08T21:18:05-05:00 simrad-ap24-ap28-control-heads 3430122 2009-08-08T21:18:05-05:00 103452 2009-08-08T22:57:24-05:00