Shadin Avionics has developed a system to enable fuel flow data to be displayed on the GNS and GTN Series Navigators. The Robinson R66 system consists of a RemoteFlo and a Fuel Flow Transducer. The Garmin navigator when interfaced with the Shadin RemoteFlo will provide fuel flow, fuel to destination, fuel reserve, endurance and real time efficiency.  

Garmin recently added display of fuel range rings that show aircraft range until operating on reserve fuel (based on pilot configurable reserve time) and total endurance. Fuel range rings require a fuel data input into the GTN which is enabled by the RemoteFlo.