Vessel constrained by her draught
Power-driven lights plus three red all-round lights in a vertical line. Normal power-driven lights plus three reds in a vertical line: she cannot leave the deep channel.
Drag across the scene to walk around the ship. Tap a light to see its name.
Lights (Rule 28)
| Light | Colour | Sector | Height above water |
|---|---|---|---|
| white forward masthead light | white | masthead, 225° (from right ahead to 22.5° abaft the beam on each side) | 16 m |
| white after masthead light (50 m and over) | white | masthead, 225° (from right ahead to 22.5° abaft the beam on each side) | 20.5 m |
| red all-round light (upper) | red | all-round, 360° | 19.4 m |
| red all-round light (middle) | red | all-round, 360° | 17.4 m |
| red all-round light (lower) | red | all-round, 360° | 15.4 m |
| green sidelight (starboard) | green | sidelight, starboard, 112.5° | 13 m |
| red sidelight (port) | red | sidelight, port, 112.5° | 13 m |
| white sternlight | white | stern, 135° (around the stern) | 6 m |
Model: a 90 m ship with the superstructure aft. Heights and positions follow COLREG Annex I (positioning of lights).
Day shapes
- cylinder · cylinder
Shapes are black and hoisted where they can best be seen: a ball at least 0.6 m in diameter, vertical spacing at least 1.5 m (Annex I, section 6). Set the trainer above to day to see them.
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
Three reds in a vertical line = constrained by draught. RAM is red-white-red.
By day: a cylinder.
Quick answers
What lights does a vessel constrained by her draught show at night?
Power-driven lights plus three red all-round lights in a vertical line. In full: white forward masthead light; white after masthead light (50 m and over); red all-round light (upper); red all-round light (middle); red all-round light (lower); green sidelight (starboard); red sidelight (port); white sternlight.
What day shapes does a vessel constrained by her draught show?
By day she shows: cylinder.
What is the fog signal of a vessel constrained by her draught?
One prolonged and two short blasts at intervals of not more than 2 minutes (Rule 35c).