Special mark

	Marks not preliminarily intended to assist navigation.
	Indicates a special area or feature.
	Exact nature is obtained from the appropriate nautical documents.

Can be used for:

	Ocean data acquisition system (ODAS) buoys.
	Traffic separation marks where use of conventional channel may cause confusion.
	Spoil ground marks.
	Military exercise zone marks.
	Cable or pipeline marks.
	Recreation zone marks.
	Channel between a channel such as limits of a deep water route in a normal route.

Color:

Yellow color.

 Topmark:

	Single X shape.
	Yellow in color.
	Optional.

Shape:

	Optional.
	Not to conflict with navigational marks.

Light:

	Yellow light.
	Rhythm may be any, other than used used for cardinal, isolated danger or safe water marks.

Symbols used in admiralty charts:

Photographs:

Special mark.	Special mark (can)

Updated: July 03, 2003