🔍 Key Concepts

• Navigation Rules Rule 27 – Vessels Not Under Command or Restricted in Their Ability to Maneuver • Standard day shapes: ball, diamond, cone and their common combinations (e.g., ball‑diamond‑ball, three balls, two cones apex together) • Which operations make a vessel restricted in her ability to maneuver (dredging, cable‑laying, etc.)

💭 Think About

• Count the shapes in the illustration and note their order from top to bottom. What combination do you see? • Which option in the list describes a vessel whose work makes her unable to keep out of the way of other vessels as required by the Rules? • Which day shape would an aground vessel show, and how does that differ from what’s pictured here?

✅ Before You Answer

• Verify which condition uses ball–diamond–ball in vertical line under Rule 27. • Confirm that a vessel not under command does NOT show any diamond – only balls. • Check what day shape a fishing vessel with trawls displays (look at Rule 26) and see if cones, not balls/diamonds, are involved.