Rule 25(e) - Sailing AND Motoring
Daylight + NIGHT consideration. A vessel proceeds under SAIL and at the same time is being propelled by MACHINERY.
Scenario briefing
Daylight + NIGHT consideration. A vessel proceeds under SAIL and at the same time is being propelled by MACHINERY. What signal identifies this dual propulsion? (Rule 25(e))
Applicable COLREG rule(s)
📸 Night recognition — 8 aspects
The same vessel rendered every 45° of aspect — bow, starboard bow, beam, quarter, stern, port quarter, beam, bow. Use this strip to learn how the lights present from each approach angle. Click any image to view full size.
Key teaching points
- Rule 25(e): a sailing vessel propelled by machinery AND sail shall exhibit forward where it can best be seen a conical shape, apex downward.
- By night the same vessel shows the lights of a power-driven vessel (Rule 23) — masthead, sidelights, sternlight.
- The Rule 18(a)(iv) priority over power-driven vessels DOES NOT apply when under sail + power.
- This is a Rule 25(e) duty that yacht crews routinely forget — the conical shape is mandatory in daylight.
Common mistakes to avoid
- Sailing with engine running and not hoisting the conical shape — common breach in pleasure-craft fleets.
- Claiming Rule 18(a)(iv) priority while motor-sailing — courts have ruled against vessels that did this.
Why it matters
Exam relevance
Rule 25(e) "motor-sailing" duty is a popular probe in Yachtmaster Coastal/Offshore and ICC orals.
Related scenarios
About SkipperCheck simulators
SkipperCheck offers two browser-based maritime training simulators:
- ARPA · AIS · COLREG Bridge Simulator — 54 scenarios covering Rules 2, 5–10, 12–19, 23–30, 34 and 35.
- VHF SRC Radio Simulator — 15 scenarios: voice Mayday, DSC distress, Mayday Relay, Pan-Pan, Sécurité, routine.
Both run in any modern browser, on desktop or mobile. No install, no plugins.