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.
To find ground speed using a flight computer slide the azimuth plate to align the wind direction.
( z1 slide :ARG1 ( z2 plate :mod ( z3 azimuth ) ) :purpose ( z4 align :ARG1 ( z5 direct :ARG1 ( z6 wind ) ) ) :purpose ( z7 find :ARG1 ( z8 speed :mod ( z9 ground ) ) :manner ( z10 use :ARG1 ( z11 computer :instrument-of ( z12 fly ) ) ) ) )