Used to indicate a newly discovered hazard to navigation. | |
The danger is not yet shown on charts or included in sailing directions. | |
The danger is not yet sufficiently promulgated by notices to mariners. | |
The term covers naturally occurring obstructions such as sandbanks or rocks. | |
It may be also man made dangers such as wrecks. |
One or more cardinal or lateral marks may be used. | |
If dangers are especially grave, at least one of the marks are duplicated. |
A quick or very quick light if lit. | |
If cardinal mark, it will exhibit white light. | |
If lateral mark, it will exhibit red or green light. |
A racon of morse code D, showing a signal length of one nautical mile may be used. |