[Code of Federal Regulations]
[Title 33, Volume 1]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 33CFR62.43]

[Page 147-148]
 
                TITLE 33--NAVIGATION AND NAVIGABLE WATERS
 
         CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
 
PART 62--UNITED STATES AIDS TO NAVIGATION SYSTEM--Table of Contents
 
              Subpart B--The U.S. Aids to Navigation System
 
Sec. 62.43  Numbers and letters.

    (a) All solid red and solid green aids are numbered, with red aids 
bearing even numbers and green aids bearing odd numbers. The numbers for 
each increase in the Conventional Direction of Buoyage. Numbers are kept 
in approximately sequence on both sides of the channel by omitting 
numbers where necessary.
    (b) Only sidemarks are numbered. However, aids other than those 
mentioned above may be lettered to assist in their identification, or to 
indicate their purpose. Sidemarks may carry letters in addition to 
numbers to identify the first aid to navigation in a waterway, or when 
new aids to navigation are added to channels with previously

[[Page 148]]

completed numerical sequences. Letters on sidemarks will follow 
alphabetical order from seaward and proceeding toward the Conventional 
Direction of Buoyage and will be added to numbers as suffixes.
    (c) Aids to navigation may be fitted with light-reflecting material 
to increase their visibility in darkness. The colors of this material 
may convey the same significance as the aid except that letters and 
numbers may be white.
    (d) Exceptions to the provisions of this section will be found on 
the Western Rivers System. See Sec. 62.51.
    (e) The guidelines for the display of numbers and letters on aids to 
navigation are identical for both Region A and Region B; red aids to 
navigation display even numbers, and green aids display odd numbers.

[CGD 86-031, 52 FR 42640, Nov. 6, 1987, as amended by CGD 88-018, 54 FR 
48608, Nov. 24, 1989]