The long-languishing aftermarket digital autopilot segment got a big boost July 18 when Garmin International announced not one, but two new autopilots. Both share similar features, but are designed for different market segments. The GFC 500 is geared toward lighter general aviation airplanes that can use a Garmin G5 solid-state attitude indicator as the primary attitude source. The GFC 600 will be of interest to those flying high-performance singles and light twins up through turbine aircraft. The GFC 600 interfaces well with Garmin G500 and G600 glass flight displays, Garmin navigators, and a variety of third-party flight displays.