daymarks (region B)
System B combines lateral and cardinal marks. It is the opposite of system A, in which starboard marks are red and port marks are green.
Red or green buoy that indicates the port or starboard limits of the channel.
safe water mark
Buoy signaling that the water is navigable.
Navigation lane with beacons that is longer or more difficult than the preferred channel.
Navigation lane with beacons; it is the shortest and safest way to a harbor or for navigating near a coast or through a waterway.
isolated danger mark
Buoy marking an isolated danger zone beyond which the waters are navigable.
East cardinal mark
Buoy with two base-to-base topmarks that is placed to the east of a danger zone.
South cardinal mark
Buoy with two topmarks pointing downward that is placed to the south of a danger zone.
Floating beacon with a pylon-shaped superstructure.
Floating beacon with a cone-shaped superstructure.
Long tubular buoy used in harbors and in waters that have no tides.
Mark the ship must keep on the left side of its prow as it navigates a channel.
West cardinal mark
Buoy with two point-to-point topmarks that is placed to the west of a danger zone.
Encoded light beam that serves as a navigation aid at night.
Buoy marking an area that is regulated for a specific use (such as military exercises or fishing) or contains submerged obstacles (such as cables or pipelines).
Mark the ship must keep on the right side of its prow as it navigates a channel.