Day shapes

Day shapes

Day Shapes are mast head signals indicating the navgation status of a vessel at sea to other vessels.

The meanings of the shapes are defined by the International Regulations for Preventing Collisions at Sea.

The most common signals are as follows:-

Navigation status Day shape Restriction
Vessel Under Sail & Power Cone > 12m
Anchored Ball > 7m (not in channel) > 20m (in anchorage)
Constrained by Draft Cylinder
Aground 3 Balls (vert. line) > 12m
Not Under Command 2 Balls (vert. line) > 12m
Restricted in Ability 1 Ball+1 Diamond+1 Ball > 12m (except dive boats)
Fishing (commercial) 2 Cones (vert. line) > 20m (but must display (nets or trawling) basket shape
Vessel Towing Diamond Tow > 200m
Vessel Being Towed Diamond Tow > 200m

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