Drift Indicator. An instrument by which the speed and the direction of the wind can be determined from an aeroplane in flight.
Drizzle. Rain in which the drops are very small.
WIND DRIFT INDICATOR (WDI). A wind drift indicator is used to determine the proper release point for jumpers on light aircraft operations.
Such a drift indicator is, of course, useful only when the ground is visible.
 See also: Drift, Aviation, Flight, Glide, Plane
  
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