Rule 20-31

Question 1

Rule 20: Application

Answer 1

Lights:
-Sunset to sunrise
-Daytime(Restricted Visibility)
-No other lights shall be displayed, unless they cannot be mistaken for other lights

Day Shapes
-During the Day

Question 2

Rule 21, Rule 22 (Definitions/Visibility)

Answer 2

-Masthead light, White, 225 Degree Arc
-Sidelight, Red(Port), Green(Starboard), 112.5 Degrees
-Sternlight, White, 135 degrees
-Towing Light, Yellow, 135 Degrees
-All Around Light, Various, 360

-Flashing Light: frequency of 120 flashes per minute or more

-Special Flashing Light: frequency of 50-70 flashes per minute

Question 3

Rule 23(PDV Underway)

Answer 3

-Masthead light Foward
-Second masthead light aft and above, if greater than 50 meters
-Sidelights
-Sternlights

Question 4

Air-cushion vessel:

Answer 4

-Same as PDV
-Yellow Light

WIG:
-Same as PDV
-High intensity of all-round fishing red light

PDV LLess than 12 m:
-All-round white light combined mast headlight/stern light
-side lights

PDV Less

Question 5

WIG

Answer 5

-Same as PDV
-High intensity of all-round fishing red light

Question 6

PDV Less than 12 m:

Answer 6

-All-round white light combined mast headlight/stern light
-side lights

Question 7

PDV less than 7m and speed less than 7 knots:

Answer 7

All-round white light
-sidelights if possible

Question 8

Power-Driven Vessel When Towing(Rule 24)

Answer 8

-Two masthead lights in a vertical line
-If the length of the tow is > 200 m: three masthead lights in a vertical line and a diamond dayshape
-Sidelights
-Sternlights
-Towing Light in the line above stern light

Question 9

Pushing(Rule 24)

Answer 9

Rigidly Connect: lights will be the same as a PDV of equal length.
(Stern, Mast, and Sidelights)

Question 10

Rule 24: International

Answer 10

-PDV pushing ahead or towing alongside:
-Two masthead lights in a vertical line
-Sidelights
-Sternlight

Question 11

Rule 24: Inland

Answer 11

PDV pushing ahead or towing alongside:
-Two masthead lights in a vertical line
-Sidelights
-Two towing lights in a vertical line

Question 12

A vessel being towed:

Answer 12

-Sidelights
-Sternlights
-When the length of the tow exceeds 200 m, a diamond day-shape

Question 13

An inconspicuous, partly submerged vessel or object being towed

Answer 13

• <25m in breadth: one all-round white light at or near the forward end and one at or near the aft end
• > 25m in breadth: two additional all-round white lights at or near the extremities of its breadth
• > 100m in length: additional all-round white lights so the distance between them does not exceed 100 m

-A diamond day shape at or near the aft-most extremity

• > 200 m: an additional diamond day shape near the forward end

Question 14

Sailing Vessel Underway(Rule 25)

Answer 14

-Sidelights
-Sternlights
- If < 20 m in length: sidelights and stern lights may be combined at the top of the mast
-Two all-round red and green lights
-Red over a green sailing machine

Use of machinery will have conical day shape with apex down.

Question 15

Fishing Vessels(Trawling): Rule 26

Answer 15

-Vessel engaged in fishing underway or at anchor:

Trawling- Green over white, trawling at night
> 50 m: masthead light abaft and higher than green light
-Day Shape: Two cones with apexes together
-When making way: sidelights and stern lights

Question 16

Fishing General Lights

Answer 16

-Red Over White, Fishing at Night
-Two all-round lights in a vertical line: red over white
-Dayshape: two cones, apexes together
-If the gear extends greater than 150 m horizontally: an all-round white light in the direction of the gear or a cone apex upwards
-When making way, sidelights and a stern lights

Question 17

Rule 27: NUC

Answer 17

A vessel not under command:
-Two all-round red light in a vertical line
-Red over red, captain is dead
-Two balls in a vertical line
-If making way, sidelights and a sternlight
(two balls)

Question 18

Restricted in her ability to maneuver(Rule 27)

Answer 18

-Three all-round lights in a vertical line: red, white, red
-Day shapes: ball, diamond, ball
- Making way: masthead light(s), sidelights, and stern light
- If at anchor: red, white, red or ball, diamond, ball and anchor lights and shapes

-If engaged in towing, which restricts the ability to maneuver: RAM and towing lights and shapes

Question 19

Mine clearing(Rule 27)

Answer 19

Green cross, red in the center
-Mast headlight or stern light

Question 20

(Rule 28) Constrained by Draft

Answer 20

-Light for a PDV and:
-Three all-round red lights in a vertical line
-Dayshape: Cylinder
-International only

Question 21

Rule 29: Pilot

Answer 21

-Two all-round red lights
-White over red, pilot ahead
-When underway: Sidelights, Sternlights
-When at anchor: White over red and anchor lights

Question 22

Rule 30(Anchored Vessels and Vessels Aground)

Answer 22

A vessel at anchor:
-All-round white light forward
-All-round white light aft and lower
-Dayshape: Ball
- <50 m only one all-around white light
- > 100 m: working lights to illuminate decks

Question 23

Vessel Aground

Answer 23

-Anchor Lights
-Two all-round red lights in a vertical line
-Dayshape: Three balls in a vertical line