The term “New Danger” is used to describe newly discovered hazards not yet shown on nautical charts. These hazards include natural obstructions, such as sandbanks or rocks, or man-made dangers such as wrecks. The new danger will be marked according to the rules and should have an appropriate cardinal or lateral very quick flashing or quick flashing light characteristic. If the danger is very grave the mark will be duplicated. The duplicated mark is identical to its partner and may carry a racon coded “W” or Whiskey, with a signal length of 1 nautical mile on the radar screen. The duplicated mark will be removed when the new danger has been sufficiently promulgated.