Definition.
A newly discovered hazard to navigation not yet shown on the charts or included in sailing directions, nor sufficiently promulgated by notices to mariners, is termed a New Danger. The term covers naturally occurring obstructions such as sandbanks, or rocks or man-made dangers such as wrecks.

Marking.
Cardinal or lateral marks, one or more, are used to mark new dangers in accordance with the IALA system. If the danger is especially grave, at least one of the marks will be duplicated as soon as is practicable by an identical mark until the danger has been sufficiently promulgated.

A quick or very quick light will be exhibited from a new danger mark, if it is lighted. If it is a cardinal mark, it will exhibit a white light, if a lateral mark, a red or green light.

A racon, morse code D, showing a signal length of 1 nautical mile on a radar display, may be used to mark a new danger.

New dangers.