Hi Tottigol and 904
Does the 139 use Garmin systems? I only ask because our 135s started arriving with Garmin 430 which do the same. I was dumfounded that a modern navigation unit would work this way since RNAV 2 and I think even RNAV 1 units that I worked with in the past could calculate fuel at each waypoint.
Cheers
TeeS