The accuracy of the, manually calculated, DR-position of an aircraft is, among other things, affected by:

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the accuracy of the adjustment of the position lines for the motion of the aircraft between the last fix and theDR-position.

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the accuracy of the adjustment of the position lines for the motion of the aircraft between the last and the newDR-nosition.

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the accuracy of the forecasted wind.

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the accuracy of the actual wind.

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