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Table 5-3.–Markings from the IALA Maritime Buoyage Systems incorporated into the U.S. Aids to
Navigation
Starboard-hand Lateral Aids:
Color: Red
Shape: Nun or Lighted
Light (when fitted): Red
Rhythm: Any, other than Comp Gp Fl (2+ 1)
Changes: Lights-from white or red to red only
Port-hand Lateral aids:
Color: Green
Shape: Can or Lighted
Light (when fitted): Green
Rhythm: Any, other than Comp Gp Fl (2+1)
Changes: Color-From black to green
Lights-From white or green to green only
Preferred Channel to Starboard:
Color: Horizontally banded green over red over green
Shape: Can or Lighted
Light (when fitted): Green
Rhythm: Comp Gp Fl (2+1)
Changes: Color-From black to green
Lights-From white or green to green only
Light rhythm-From I Qk Fl to Comp Fl (2+1)
Preferred Channel to Port:
Color: Horizontally banded red over green over red
Shape: Nun or lighted
Light (when fitted): Red
Rhythm: Comp Gp Fl (2+1)
Changes: Color-From black yo green
Lights-From white or red to red only
Light rhythm-From I Qk Fl to Comp Gp Fl (2+1)
Safe Water:
Color: Vertically striped red-and-white
Shape: Spherical or lighted (if lighted, red topmark)
Topmark (when required): Single red sphere
Light (when fitted): White
Rhythm: Morse A
Changes: Color-From black-and-white to red-and-white
Shape-Nonspherical buoys will have topmark
Nun and can buoys will not
Special Purpose:
Color: Yellow
Shape: Optional, but not conflicting with navigational mark
Light (when fitted): Yellow
Rhythm: Any, other than Qk Fl, Gp Qk Fl, Gp Qk & L Fl,
V Qk Fl, Gp V Qk Fl, Gp V Qk Fl & L FL, Gp Fl (2)
Iso, Occ, L Fl, MO (A), or MO (U)
Changes: Color-From various color combinations to yellow
All special-purpose aids will be yellow and, when lighted, will use yellow lights
Information and Regulatory Markers: No Change
5-30
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