🔍 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.