Lights and signs. COLREGs-72. Accelerated study method.
International Regulations for Preventing Collisions. Part C. Lights and Shapes.
42. What is the name of Rule 20 of the COLREGs 1972?
Application.
43. What is the name of Rule 21 of the COLREGs 1972?
Definition.
44. What is the name of Rule 22 of the COLREGs 1972?
Visibility of Lights.
45. What is the name of Rule 23 of the COLREGs 1972?
Power-driven vessels underway.
46. What is the name of Rule 24 of the COLREGs 1972?
Towing and pushing vessels.
47. What is the name of Rule 25 of the COLREGs 1972?
Sailing vessels underway and vessels under oars.
48. What is the name of Rule 26 of the COLREGs 1972?
Fishing vessels.
49. What is Rule 27 of the COLREGs 1972?
Vessels not under command or restricted in their ability to maneuver.
50. What is Rule 28 of the COLREGs 1972?
Vessels constrained by their draft.
51. What is Rule 29 of the COLREGs 1972?
Pilot vessels.
52. What is Rule 30 of the COLREGs 1972?
Vessels at anchor and vessels aground.
53. What is Rule 31 of the COLREGs 1972?
Seaplanes.
Rule 20. Application. Part C – Lights and Shapes.
1. Under what weather conditions must the rules of Part C – Lights and Shapes be complied with?
The rules of this Part must be complied with in all weather conditions.
2. During what time of day must the lights prescribed by the COLREGs be exhibited?
From sunset to sunrise.
3. k. When may or must the lights prescribed by the COLREGs be exhibited by day?
In conditions of restricted visibility and in all other circumstances when considered necessary. Rule 20 (c)
4. k. When must the rules relating to shapes be complied with?
The rules relating to shapes must be complied with by day.
Rule 21. Definition. Part C – Lights and Shapes.
1. Define "Masthead Light"?
"Masthead Light" is a white light placed on the fore-and-aft centreline of the vessel, showing an unbroken light over an arc of the horizon of 225° and so fixed as to show the light from right ahead to 22.5° abaft the beam on each side.
2. Define "Sidelights"
"Sidelights" are a green light on the starboard side and a red light on the port side; Each of these lights shows an uninterrupted light over an arc of the horizon of 112.5° and is so fixed as to show the light from right ahead to 22.5° abaft the beam on the corresponding side. On a vessel less than 20 m in length, the sidelights may be combined in a single lantern, displayed on the vessel's centerline.
3. What is the definition of "sternlight"?
A "sternlight" is a white light, placed as far as practicable as the stern, showing an uninterrupted light over an arc of the horizon of 135° and so fixed as to show the light from right ahead to 67.5° on each side.
4. What is the definition of "towing light"?
A "towing light" is a yellow light having the same characteristics as a "sternlight."
5. What is the definition of "all-round light"?
An "all-round light" is a light that illuminates a 360° arc of the horizon with an uninterrupted light.
6. Define "flashing light"?
A "flashing light" is a light that flashes at regular intervals at a rate of 120 or more flashes per minute.
Rule 22. Visibility of Lights. Part C. Lights and Shapes.
1. At what minimum range should a masthead light be visible on vessels of 50 meters or more in length?
Masthead light: 6 miles.
2. At what minimum range should a sidelight be visible on vessels of 50 meters or more in length?
3 miles.
3. At what minimum range should a sternlight be visible on vessels of 50 meters or more in length?
3 miles.
4. At what minimum range should a towing light be visible on vessels of 50 meters or more in length?
3 miles.
5. At what minimum distance must a white, red, green, or yellow all-round light be visible on vessels 50 meters or more in length?
3 miles.
6. At what minimum distance must a masthead light be visible on vessels 12 meters or more but less than 50 meters in length?
5 miles for a masthead light, but 3 miles for vessels less than 20 meters in length.
7. At what minimum distance must a masthead light be visible on vessels 12 meters or more but less than 50 meters in length?
2 miles for a sidelight.
8. At what minimum distance must a sternlight be visible on vessels 12 meters or more but less than 50 meters in length?
2 miles for a sternlight.
9. At what minimum distance must a towing light be visible on vessels 12 meters or more but less than 50 meters in length?
2 miles for a towing light.
10. At what minimum range must a white, red, green, or yellow all-round light be visible on a vessel 12 meters or more but less than 50 meters in length?
White, red, green, or yellow all-round light – 2 miles.
11. At what minimum range must a masthead light be visible on a vessel less than 15 meters in length?
Masthead light – 2 miles.
12. At what minimum range must a sidelight be visible on a vessel less than 15 meters in length?
Sidelight – 1 mile.
etc.