Angle of Uncertainty

From International Dictionary of Marine Aids to Navigation
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2-5-230

the angle of uncertainty is the region where the colour and/or the flash rhythm change and where the resulting colour of the light is mixed/affected by two colours, or showing fading intensity due to a blanking screen.

Ch2 Fig45.jpg




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)