OTHER BUOYS

ISOLATED DANGER

An isolated danger mark is used to indicate a hazard to shipping such as a submerged rock or wreck which has navigable water all around it. It is erected or moored above the hazard.

The double sphere topmark is an important feature and needs to be visible by day. The topmarks should be as large as possible with the spheres clearly separated.

  1. Color: Black With One Or More RED Bands.
  2. Shape: Pillar Or Spar.
  3. Top-Mark (When Fitted): Two BLACK Spheres One Above The Other.
  4. Retroreflector: One Or More Pairs Of BLUE Above RED Bands Are Used In The Comprehensive Code.
  5. Lights (When Fitted):
    • Color: WHITE.
    • Rhythm: Group Flashing (2), As Per The Examples Below:

SAFE WATER

Safe water marks indicate there is navigable water all around the mark including the end of a channel or mid-channel, however, this mark does not mark a danger. They are the only mark to have vertical stripes.

  1. Color: RED And WHITE Stripes.
  2. Shape: Spherical, Pillar Or Spar.
  3. Top-Mark (When Fitted): RED Sphere.
  4. Retroreflector: RED And WHITE Stripes Or Bands Are Used In The Comprehensive Code.
  5. Lights (When Fitted):
    • Color: WHITE.
    • Rhythm:
      • Occulting.
      • Isophase
      • Long Flash
      • Morse Code ‘A’

OCCULTING

ISOPHASE

LONG FLASH

MORSE CODE 'A'

SPECIAL

Special marks do not usually assist navigation but are used to indicate a feature such as recreation zones, speed limits, mooring areas or cable and pipe lines including outfall sewerage pipes.

  1. Color: YELLOW.
  2. Shape: Optional But Must Not Conflict With That Used For A Lateral Or Safe Water Mark, But Mainly Are (Conical, Spar, Cylindrical, Pillar And Spherical).
  3. Top-Mark (When Fitted): Single YELLOW ‘X’.
  4. Retroreflector: One YELLOW Band.
  5. Lights (When Fitted):
    • Color: YELLOW.
    • Rhythm:
      • Occulting.
      • Flashing Or Group Of 4, 5 Or (Exceptionally) 6 Flashes.

FLASHING

GROUP FLASHING (4)

EMERGENCY WRECK

  1. Color: Equal Number And Dimensions Of BLUE And YELLOW Vertical Stripes (Minimum Of 4 And Maximum Of 8 Stripes).
  2. Shape: Pillar Or Spar.
  3. Top-Mark (When Fitted): Standing Or Upright YELLOW Cross.
  4. Lights (When Fitted):
    • Color: Exhibits An Alternating BLUE And YELLOW.
    • Rhythm: Flashing Light With Nominal Range Of 4 Nautical Miles, As Per The Example Below: