Cardinal marks indicate the direction of safe water at a dangerous spot.

Charts will show lighthouses, lateral buoy, cardinal marks and other navigational aids.

Cardinal marks indicate the direction of safety as a cardinal (compass) direction (north, east, south or west) relative to the mark.

The characteristics and meanings of cardinal marks are as defined by the International Association of Lighthouse Authorities.

Starting on a Friday evening, the race took competitors from Penzance to Lowlee and Mountamopus cardinal marks before passing south of Wolf Rock Lighthouse.