Vessel restricted in ability to manoeuvre (RAM)
Red, white, red all-round lights in a vertical line. "Red, white, red: restricted ahead." Her work limits her ability to manoeuvre (dredging, cable laying).
Drag across the scene to walk around the ship. Tap a light to see its name.
Lights (Rule 27b)
| Light | Colour | Sector | Height above water |
|---|---|---|---|
| red all-round light (upper) | red | all-round, 360° | 19 m |
| white all-round light (middle) | white | all-round, 360° | 17 m |
| red all-round light (lower) | red | all-round, 360° | 15 m |
| white forward masthead light (when making way) | white | masthead, 225° (from right ahead to 22.5° abaft the beam on each side) | 16 m |
| white after masthead light (when making way, 50 m and over) | white | masthead, 225° (from right ahead to 22.5° abaft the beam on each side) | 20.5 m |
| green sidelight (when making way) | green | sidelight, starboard, 112.5° | 13 m |
| red sidelight (when making way) | red | sidelight, port, 112.5° | 13 m |
| white sternlight (when making way) | 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
- ball · upper ball
- diamond · middle diamond
- ball · lower ball
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
RAM has a white light in the middle (red-white-red). NUC shows two reds with no white.
When making way she adds masthead, side and stern lights. At anchor she adds anchor lights. By day: ball, diamond, ball.
Quick answers
What lights does a vessel restricted in ability to manoeuvre (RAM) show at night?
Red, white, red all-round lights in a vertical line. In full: red all-round light (upper); white all-round light (middle); red all-round light (lower); white forward masthead light (when making way); white after masthead light (when making way, 50 m and over); green sidelight (when making way); red sidelight (when making way); white sternlight (when making way).
What day shapes does a vessel restricted in ability to manoeuvre (RAM) show?
By day she shows: upper ball; middle diamond; lower ball.
What is the fog signal of a vessel restricted in ability to manoeuvre (RAM)?
One prolonged and two short blasts at intervals of not more than 2 minutes (Rule 35c).