Mine-clearance vessel

In addition to the appropriate power-driven or anchor lights:

Lights

Three all-round green lights:

one near foremast head

one at each end of foreyard

Day

Three balls in equivalent positions.

Meaning

Mine-clearance operations are in progress.

The Rules warn that approaching within 1,000 m is dangerous.

3. US BUOYAGE

The United States principally uses IALA Region B lateral conventions, but not every waterway or U.S.-associated jurisdiction can be reduced to "red right returning." Use the chart and the established conventional direction of buoyage.