A cautionary buoy marks dangers such as firing ranges, underwater pipelines, race courses, seaplane bases and areas where no through channel exists.

Coloured yellow, displays identification letter(s).

May display a yellow "X" topmark.

Yellow light, flash (Fl) 4s (if equipped).

An anchorage buoy marks the perimeter of designated anchorage areas; consult the chart for water depth.

A mooring buoy is used for mooring or securing vessels; be aware that a vessel may be secured to such a buoy.

An information buoy displays information
such as locality, marina, campsite, etc.; Be
guided by the information illustrated within the orange square.

Coloured white. Yellow flashing light, (Fl) 4s, if equipped.

A hazard buoy marks random hazards such as shoals and rocks. Information concerning the hazard is illustrated within the orange diamond.

Coloured white. Yellow flashing light (Fl) 4s, if equipped.

A control buoy indicates speed limits, wash restrictions, etc.; Obey the restrictions illustrated within the orange circle.

Coloured white. Yellow flashing light (Fl) 4s, if equipped.

A keep out buoy marks areas in which boats are prohibited.

Coloured white. Yellow flashing light (Fl)4s, if equipped.

An ocean data acquisition system buoy collects meteorological and other scientific data.

A diving buoy marks an area where scuba or other such diving activity is in progress. Not normally charted.

Coloured white, with a red flag and diagonal white stripe, not less than 50 centimetres square.

Flashing yellow light (Fl)4s, if equipped.

A swimming buoy marks the perimeter of swimming areas. May not be charted.

Coloured white. Flashing yellow light (Fl) 4s, if equipped.

All vessels engaged in diving operations are required to display the code flag "A".