🔍 Key Concepts

• Rule 24 – Towing and Pushing: When is a diamond day shape required for tows, and where is it displayed? • Rule 27 – Restricted in Ability to Manoeuvre (RAM): What day shape shows that a vessel is restricted in her ability to deviate from her course? • Difference between a long tow (over 200 m) requirement and a tow that is severely restricted in ability to maneuver, even if it is under 200 m.

💭 Think About

• Ask yourself: Is this question testing the length of the tow, the restricted maneuverability, or both? Which part of the description actually triggers the special day shapes? • Look carefully at the illustration: which unit in the tow is actually doing the towing work, and which unit(s) are merely being towed? Which vessel needs to show the restricted‑ability signal? • For the diamond shape requirement, where does the Navigation Rules say it must be shown: only on the towing vessel, only on the last vessel, or on both—and under what tow length condition?

✅ Before You Answer

• Verify from Rule 24(e) when a single diamond day shape is required and where it is placed for a tow exceeding 200 meters. • Verify from Rule 27(b) what day shape a vessel restricted in her ability to maneuver must display by day. • Before choosing, check whether a tow less than 200 meters is still required to show the diamond shape on the towing vessel or the last barge, or if that only applies when the tow length exceeds 200 meters.