Observe and identify

Developing level, about 2 min. International COLREGs / IRPCS.

The situation

A vessel ahead is showing a daytime shape. Inspect the shape and its vertical arrangement with the binoculars. The vessel’s name and status are withheld until your answer.

Which operation or status does this daytime signal indicate?

Sailing vessel using machinery
Constrained by draught
At anchor

Answers and explanations

Lookout: A sailing vessel also propelled by machinery shows a cone with apex down forward where it can best be seen. She is power-driven for the steering rules.

The sound answer

Sailing vessel using machinery

A sailing vessel also propelled by machinery shows a cone with apex down forward where it can best be seen. She is power-driven for the steering rules.

Why the other options fall short

Constrained by draught

Constrained by draught uses cylinder. The displayed signal here indicates sailing vessel using machinery. A sailing vessel also propelled by machinery shows a cone with apex down forward where it can best be seen. She is power-driven for the steering rules.

At anchor

At anchor uses ball. The displayed signal here indicates sailing vessel using machinery. A sailing vessel also propelled by machinery shows a cone with apex down forward where it can best be seen. She is power-driven for the steering rules.

Rule 25(e) · Day shapes