Garmin G3X Touch

The ADAHRS gives the displays attitude and air data, the magnetometer gives heading, and the OAT probe gives outside air temperature. Standard suits most kit aircraft; choose High performance for over 300 knots. Choose None if a G5 gives attitude and air data and the G3X shows only map and engine.

Up to three ADAHRS can be installed. Each display can show a different one, any display can be switched to any of them, and the system compares them and flags a disagreement. Match the first: a GSU 25D where it is over 300 knots.

The displays need at least one GPS source. An antenna mounted outside gives the best reception; the GA 57X also brings SiriusXM. Choose the last answer if a transponder with GPS or a GNX 375 already feeds the G3X.

The GEA 24B reads the engine sensors (temperatures, pressures, fuel) and shows them on the G3X Touch. Choose None if the engine has its own monitor.

The GFC 500X autopilot's servos move the controls. Roll only holds the wings level and follows a course; pitch and roll also holds altitude and climbs or descends; a third servo adds a yaw damper.

A pitot probe that also measures angle of attack, for the displays' AOA indicator. Choose heated for flight in visible moisture.

A transponder mounted behind the panel and run from the displays. ADS-B Out is required in most controlled airspace; ADS-B In adds traffic and weather on the displays.

Extras that work with the G3X Touch. None is needed to fly; tick any you want and they join the list.