Section 281.1106. Numbers, letters, or words on markers.

(1) Numbers, letters or words on  an  aid  to   navigation  or regulatory marker shall be placed in a manner as to be clearly visible to an approaching or passing vessel.  They  shall   be  block   style, well-proportioned and as large as the available space permits. Numbers and letters on red or black backgrounds shall be white; numbers  and  letters  on white backgrounds shall be black.

(2)   Odd numbers shall be used to identify solid colored black buoys or black topped buoys; even numbers shall be used to identify solid colored red buoys or red topped buoys. All numbers shall increase in an upstream direction or toward the head of navigation. The use of numbers to identify buoys is discretionary unless required as specified in the permit.

(3)    Letters only may be used to identify regulatory and red vertically striped obstruction   markers.  When   used,  the  letters   shall   follow alphabetical sequence in an upstream direction or toward the head of navigation. The letters I and O shall be omitted  to   preclude  confusion with numbers. The use of letters to identify  regulatory and   obstruction markers is discretionary unless required as specified in the permit.

History: 1979 AC.