INTERNATIONAL ONLY At night you sight the...

🔍 Key Concepts

• Study Navigation Rules Rule 24 (Towing and Pushing) and Rule 26 (Fishing Vessels) for the required light patterns. • Note which lights in the diagram are masthead (white, carried on the centerline) and which are **sidelights (red/green, low and separated). • Compare how fishing lights (all‑round, vertical over each other) differ from towing lights (masthead + sidelights of another hull).

💭 Think About

• Ask yourself: Do the two vertical white lights on the right look more like masthead towing lights on one power‑driven vessel, or like the all‑round lights shown for fishing in Rule 26? • Look at the red and green lights on the left: do they form a normal set of vessel sidelights (port and starboard of another hull), or do they match the vertical/all‑round patterns used for pair trawling? • If a large ship were simply being assisted by a tug, what lights would the ship itself still be required to show under Rule 23 (Power‑driven vessels underway), and do you see those in the illustration?

✅ Before You Answer

• Identify which lights must be all‑round versus directional sidelights; fishing shapes/lights are all‑round and usually vertical, not widely separated horizontally. • Verify whether pair trawling under Rule 26 requires special additional fishing lights (e.g., green over green) that you do NOT see here. • Confirm that a tug with a tow alongside shows towing masthead lights on the tug plus the tow’s sidelights, and ask whether this pattern matches the relative placement in the illustration.

INTERNATIONAL ONLY At night you sight the lights shown in illustration D066RR below. What do the lights indicate?

Two vessels pair trawling

A vessel engaged in fishing

A tug with a tow alongside

A ship being assisted by a tug

🔍 Key Concepts

💭 Think About

✅ Before You Answer