Shapes

Day shapes

Day shapes are mast head signals visually indicating the status of a vessel to other vessels on navigable waters during daylight hours whether making-way, anchored, or aground. These signals consist of a set of simple geometric shapes ball, cylinder, cone, and diamond that are displayed, hung from a mast, in a prescribed manner to indicate a vessel's operational status.

Restricted in ability

Aground

Anchored

Constrained by draft

Fishing

Minesweeper

Not under command

Towing

Under sail and power