Definition
A cardinal mark is named for the quadrant of safe water relative to the danger, so a north cardinal is passed on its north side. Bodies are pillar or spar, painted black and yellow, and always carry two black cones as a topmark. The cones point toward the black band or bands: both up for north, both down for south, base to base for east, point to point for west. Lights are always white and quick or very quick.
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