Cardinal marks 1

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Every Cardinal mark is named after the quadrant in which it is placed.
Therefore, we have the North Cardinal mark, the East Cardinal mark, the South Cardinal mark, and the West Cardinal mark.
The mariner is safe if he passes; north of the north mark, east of the east mark, south of the south mark, and west of the west mark.
The North Cardinal mark has a shape of a pillar or spar, and is colored black above yellow. As a top mark it has two black cones, one above the other, with the points showing upward.
The North Cardinal mark exhibits a white light with a rhythm of very quick flashing (approximately 100 or 120 flashes per minute), or quick flashing (approximately 50 or 60 flashes per minute).