Definition
A very quick light flashes at 80 to 159 flashes per minute, conventionally 100 or 120. It carries exactly the same meanings as Q on cardinal marks but on a shorter overall period: VQ for north, VQ(3)5s east, VQ(6) plus long flash 10s south and VQ(9)10s west. Ultra quick, UQ, at 160 or more flashes per minute, is rarer and appears on some offshore structures and lightfloats where extreme conspicuity is wanted.
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