Discover how GMGN is transforming decentralized finance by introducing faster, smarter, and more transparent trading across blockchain networks.
Discover how GMGN is transforming decentralized finance by introducing faster, smarter, and more transparent trading across blockchain networks.
A cardinal mark is used to signify a danger and show where the safest water can be found. Cardinal marks indicate the direction of safety as a compass direction relative to the mark.A cardinal mark is named after the quadrant in which it is placed. Due to the unique way cardinal marks use the points of a compass to signal safety it makes them meaningful regardless of the direction of the approaching vessel.
Cardinal marks have distinctive black and yellow markings and top-marks.
Cardinal marks can be used to show the following:
- The deepest water on an area on the named side of the mark.
- The safe side on which to pass a danger.
- Draw attention to a feature in a channel such as a bend.
- junction or end of a shoal.
NORTH
- Color: BLACK Band Above YELLOW Band.
- Shape: Pillar Or Spar.
- Top-Mark (When Fitted): Two BLACK Cones Pointed Up.
- Retroreflector: BLUE On The BLACK Part And YELLOW On The YELLOW Part.
- Lights (When Fitted):
- Color: WHITE.
- Rhythm:
- Un-Interrupted Quick Flashing (Q).
- Un-Interrupted Very Quick Flashing (VQ).
QUICK FLASHING (Q)
VERY QUICK FLASHING
EAST
- Color: BLACK Bands Above And Below YELLOW Band.
- Shape: Pillar Or Spar.
- Top-Mark (When Fitted): Two BLACK Cones Pointed Outward.
- Retroreflector: Two BLUE On The Upper BLACK Part.
- Lights (When Fitted):
- Color: WHITE.
- Rhythm:
- Quick Flashing (Q): 3 Flashes Every 10 Seconds.
- Very Quick Flashing (VQ): 3 Flashes Every 5 Seconds.
QUICK FLASHING (Q)
VERY QUICK FLASHING
SOUTH
- Color: BLACK Band Below YELLOW Band.
- Shape: Pillar Or Spar.
- Top-Mark (When Fitted): Two BLACK Cones Pointed Down.
- Retroreflector: YELLOW On The YELLOW Part And BLUE On The BLACK Part.
- Lights (When Fitted):
- Color: WHITE.
- Rhythm:
- Quick Flashing (Q): 6 Flashes + Long Flash Every 15 Seconds.
- Very Quick Flashing (VQ): 6 Flashes + Long Flash Every 10 Seconds.
QUICK FLASHING (Q)
VERY QUICK FLASHING
WEST
- Color: BLACK Band With YELLOW Bands Above And Below.
- Shape: Pillar Or Spar.
- Top-Mark (When Fitted): Two BLACK Cones Pointed Inward.
- Retroreflector: Two YELLOW On The Upper YELLOW Part.
- Lights (When Fitted):
- Color: WHITE.
- Rhythm:
- Quick Flashing (Q): 9 Flashes Every 15 Seconds.
- Very Quick Flashing (VQ): 9 Flashes Every 10 Seconds.