IRPCS Part 3 - Lights & Shapes

Question 1

What lights does a power-driven vessel under way show at night?

Answer 1

Masthead light, sidelights, and a stern light.

Question 2

What additional light is required for a power-driven vessel over 50m?

Answer 2

A second masthead light abaft and higher than the forward one.

Question 3

What lights does a sailing vessel under way show?

Answer 3

Sidelights and a stern light.

Question 4

What is shown by a sailing vessel less than 20m in length?

Answer 4

Combined lantern at the top of the mast showing red and green sidelights and white stern light.

Question 5

What lights are shown by a vessel at anchor?

Answer 5

An all-round white light or one at the bow and stern if over 50m.

Question 6

What lights are shown by a vessel aground?

Answer 6

Two all-round red lights in a vertical line and anchor lights.

Question 7

What does a fishing vessel (trawling) show?

Answer 7

Green over white all-round lights and sidelights when underway.

Question 8

What does a fishing vessel (not trawling) show?

Answer 8

Red over white all-round lights and sidelights when underway.

Question 9

What lights are shown by a vessel not under command?

Answer 9

Two all-round red lights in a vertical line.

Question 10

What lights are shown by a vessel restricted in her ability to manoeuvre?

Answer 10

Red-white-red all-round lights in a vertical line.

Question 11

What day shape does a vessel at anchor show?

Answer 11

A black ball.

Question 12

What day shape does a vessel aground show?

Answer 12

Three black balls in a vertical line.

Question 13

What day shapes does a sailing vessel show when also under power?

Answer 13

A cone, apex downwards.

Question 14

What day shape does a vessel not under command show?

Answer 14

Two black balls in a vertical line.

Question 15

What day shape does a vessel restricted in her ability to manoeuvre show?

Answer 15

Ball-diamond-ball in a vertical line.

Question 16

What day shape does a fishing vessel show?

Answer 16

Two cones with apexes together.

Question 17

What lights are shown by a tug towing more than 200m?

Answer 17

Three masthead lights in a vertical line, sidelights, and a stern light.

Question 18

What day shape is shown by a vessel towing more than 200m?

Answer 18

A diamond shape.

Question 19

What lights are shown by a pilot vessel on duty?

Answer 19

White over red all-round lights.

Question 20

What day shape is shown by a vessel constrained by her draught?

Answer 20

A cylinder.

Question 21

What light configuration indicates a dredger with obstruction on one side?

Answer 21

Red light on obstructed side, green on the clear side.

Question 22

What do three all-round green lights in a triangle indicate?

Answer 22

A mine clearance vessel.

Question 23

What lights are shown by a vessel being towed?

Answer 23

Sidelights and a stern light.

Question 24

What light does a vessel less than 7m and under 7 knots show?

Answer 24

If practical, all-round white light.

Question 25

What lights does a vessel under oars show?

Answer 25

If possible, same as sailing vessel; otherwise, a torch or lantern.

Question 26

What lights does a hovercraft show when not flying?

Answer 26

Same as a power-driven vessel.

Question 27

What light indicates a diving operation?

Answer 27

Red over white over red all-round lights.

Question 28

What day shape indicates diving?

Answer 28

Code flag 'A' (white and blue) and a rigid replica if possible.

Question 29

What light does a sailing vessel under 7m show?

Answer 29

If practical, sidelights and stern light; otherwise, a torch or lantern.

Question 30

When should day shapes be displayed?

Answer 30

During daylight hours when applicable.