Vertical motion due to rough SEAS - My favorites quotes from the famous Bowditch

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"If a vessel has considerable vertical motion due to rough SEAS, a light sighted on the horizon may alternately appear and disappear. Wave tops may also obstruct the light periodically. This may cause the characteristic to appear different than expected. The light’s true characteristics can be ascertained either by closing the range to the light or by increasing the observer’s height of eye."

CHAPTER 4. NAUTICAL PUBLICATIONS

BOWDITCH

THE AMERICAN PRACTICAL NAVIGATOR

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