24 - Lights and Shapes; Towing and Pushing

Question 1

PDV when towing

Length of tow >200m; 3 white masthead lights

Answer 1

• Two masthead lights in a vertical line
• Three lights are needed for length of tows >200m
• Sidelights
• Sternlight
• Towing light above sternlight

Length of tow <200m; 2 white masthead lights

Question 2

PDV when pushing or towing as a composite unit

International only

Length of tow <200m; Vessel is <50m in length

Answer 2

Shall be regarded as a PDV

PDV <50m

Question 3

PDV when pushing ahead or towing alongside

International only

Answer 3

• Two masthead lights
• Sidelights
• Sternlight

Question 4

PDV when pushing ahead or towing alongside

Yellow over Yellow, Pushing an American fellow

Inland only

Answer 4

• Two masthead lights
• Sidelights
• Two towing lights

Question 5

Additional towing astern examples

Answer 5

Question 6

Lights on the vessel or object being towed

Answer 6

• Sidelights
• Sternlight
• If the Length of Tow exceeds 200m a diamond shape will be used

Question 7

Provided that any number of vessels being towed alongside or pushed…

Answer 7

It shall be lighted as one vessel

Question 8

Provided that any number of vessels being towed alongside or pushed…

International only

Answer 8

It shall be lighted as one vessel

Question 9

Provided that any number of vessels being towed alongside or pushed…

Inland only

Answer 9

It shall be lighted as one vessel
If a vessel is being towed on both sides
- A sternlight shall be on the outboard vessels
- Single set of sidelights as far FWD and as far outboard as is practicable
- Single special flashing light

Difference is the special flashing light

Question 10

Inconspicuous, partly submerged vessel or object

International only

Answer 10

• ## < 25m in breadth