Decision height (DH) is a specified height above the ground in an instrument approach procedure at which the pilot must decide whether to initiate an immediate missed approach if the pilot does not see the required visual reference, or to continue the approach. Decision height is expressed in feet above ground level.
ICAO–Annex 6 –
A specified height in the precision approach at which a missed approach must be initiated if the required visual reference to continue the approach has not been established
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