Dredger with an obstruction (RAM at work)
RAM lights plus red pair over the obstruction and green pair on the clear side. RAM at work: two reds mark the blocked side, two greens the clear side. Pass on the green (diamond) side.
Drag across the scene to walk around the ship. Tap a light to see its name.
Lights (Rule 27d)
| Light | Colour | Sector | Height above water |
|---|---|---|---|
| red all-round light (upper, RAM) | red | all-round, 360° | 16 m |
| white all-round light (middle, RAM) | white | all-round, 360° | 14 m |
| red all-round light (lower, RAM) | red | all-round, 360° | 12 m |
| red all-round light over the obstruction (upper) | red | all-round, 360° | 8 m |
| red all-round light over the obstruction (lower) | red | all-round, 360° | 6 m |
| green all-round light on the clear side (upper) | green | all-round, 360° | 8 m |
| green all-round light on the clear side (lower) | green | all-round, 360° | 6 m |
Model: a 55 m vessel. Heights and positions follow COLREG Annex I (positioning of lights).
Day shapes
- ball · upper ball (RAM)
- diamond · middle diamond (RAM)
- ball · lower ball (RAM)
- ball · upper ball over the obstruction
- ball · lower ball over the obstruction
- diamond · upper diamond on the clear side
- diamond · lower diamond on the clear side
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
Balls hang over the obstruction, diamonds over the clear side. At night the same story in lights: red = blocked, green = pass here.
At anchor she shows these lights and shapes instead of anchor lights.
Quick answers
What lights does a dredger with an obstruction (RAM at work) show at night?
RAM lights plus red pair over the obstruction and green pair on the clear side. In full: red all-round light (upper, RAM); white all-round light (middle, RAM); red all-round light (lower, RAM); red all-round light over the obstruction (upper); red all-round light over the obstruction (lower); green all-round light on the clear side (upper); green all-round light on the clear side (lower).
What day shapes does a dredger with an obstruction (RAM at work) show?
By day she shows: upper ball (RAM); middle diamond (RAM); lower ball (RAM); upper ball over the obstruction; lower ball over the obstruction; upper diamond on the clear side; lower diamond on the clear side.
What is the fog signal of a dredger with an obstruction (RAM at work)?
One prolonged and two short blasts at intervals of not more than 2 minutes (Rule 35c).