How to use a graphic flight computer to find ground speed and true heading<br>Align the wind direction under the " true index " mark by rotating the azimuth plate. If the winds are from 330 ° at 20 knots, align 330 under the true index. Align the grid so the center grommet is over one of the heavy lines.
ground speed and true heading can only be found with a graphic flight computer
( z1 possible :ARG1 ( z2 find :ARG1 ( z3 and :op ( z4 speed :mod ( z5 ground ) ) :op ( z6 heading :ARG1-of ( z7 true ) ) ) :instrument ( z8 computer :mod ( z9 fly ) :mod ( z10 graphic ) ) :mod ( z11 only ) ) )