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.

lateral mark

Red or green buoy that indicates the port or starboard limits of the channel.

safe water mark

Buoy signaling that the water is navigable.

secondary channel

Navigation lane with beacons that is longer or more difficult than the preferred channel.

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.

pillar buoy

Floating beacon with a pylon-shaped superstructure.

conical buoy

Floating beacon with a cone-shaped superstructure.

spar buoy

Long tubular buoy used in harbors and in waters that have no tides.

port hand

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.

light

Encoded light beam that serves as a navigation aid at night.

special mark

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).

starboard hand

Mark the ship must keep on the right side of its prow as it navigates a channel.