Sailing vessel underway
Sidelights and sternlight only, no masthead light. No white masthead light. Sidelights and a sternlight alone say: sailing vessel.
Drag across the scene to walk around the ship. Tap a light to see its name.
Lights (Rule 25)
| Light | Colour | Sector | Height above water |
|---|---|---|---|
| green sidelight (starboard) | green | sidelight, starboard, 112.5° | 1.6 m |
| red sidelight (port) | red | sidelight, port, 112.5° | 1.6 m |
| white sternlight | white | stern, 135° (around the stern) | 1.5 m |
Model: a 12 m vessel. Heights and positions follow COLREG Annex I (positioning of lights).
Fog signal
One prolonged and two short blasts at intervals of not more than 2 minutes (Rule 35c).
A short blast lasts about 1 second, a prolonged blast 4 to 6 seconds (Rule 32). The play button is in the trainer above.
What to watch for
A vessel under sail AND engine at the same time is a power-driven vessel (by day: a cone, apex down, forward; Rule 25e).
May additionally show two all-round lights in a vertical line at the masthead: red over green (not together with the combined lantern allowed under 20 m).
Quick answers
What lights does a sailing vessel underway show at night?
Sidelights and sternlight only, no masthead light. In full: green sidelight (starboard); red sidelight (port); white sternlight.
What is the fog signal of a sailing vessel underway?
One prolonged and two short blasts at intervals of not more than 2 minutes (Rule 35c).