I have a D-100 and D-120 in my RV-7A with about 45 hours on the airplane. The "fuel at waypoint" was reading accurately until yesterday, and on two flights with a destination selected in the Garmin 430 it read zero. All the other readings worked as before, including those presenting data required to compute the fuel at waypoint. Is there a reset, or something else I need to do to cause the fuel computer to generate this reading if all the required data is available. Thanks, Jim.