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A buoy with two cone topmarks, saying which side of a danger holds safe water.
Also known as: Two cones buoy, Triangle topmark buoy
A cardinal mark says which side of it is safe: the two black cones on top point in a pattern that names a compass quadrant. The topmark is the message, and it is the same by day and by night.
States which side of a hazard has safe water, by the arrangement of two black cone topmarks: both up for north, both down for south, points together for east, bases together for west.
Contexts: Navigation
Repeats the same information in its black and yellow banding, so the mark can be read at a distance before the topmark resolves.
Contexts: Navigation
Belongs to a buoyage system whose lateral marks — the red and green ones — reverse their meaning between world regions, while cardinal marks do not.
Contexts: Navigation
A pillar or spar buoy banded in black and yellow, carrying two solid black cones one above the other at its top, arranged point-up, point-down, points-together or bases-together.
Aids to navigation defined in one standard.