Characteristics of lights, shapes and sound signals

Question 1

What are the light spacing characteristics for a vessel over 20m

Answer 1

20m <

1 mast head min 6m above deck, if breadth greater than 6m then light at least as high as breadth but no more than 12m

2 mast head aft light min 4.5m higher than forward

2 mast min 1/2 length of vessel aft of foresight

Fore mast max 1/4 vessel length aft of stem

Side lights 3/4 height of forward mast light

Vessel over 50m Aft anchor light min 4.5 m below forward anchor light

Lights vertically inline space of min 2m, lowest light no less than 4.5m above fore light

Additional signal lights vertically inline min 4m above deck

Question 2

What are the light spacing characteristics for a vessel less than 20m

Answer 2

12m-20m
Mast head min 2.5m above gunwal

Side lights not more than 3/4 height of forward mast light

Lights vertical inline no less than 1 meter apart and 2 m above gunwal

Question 3

Horizontal spacing of lights

Answer 3

When two mast head lights distance between shall not be less than half the length of vessel but need not be more than 100m, forward mast head shall not be more than 1/4 from stem

When one mast head required it shall be forward of amidships, except 20> then as far forward as practicable

Question 4

Sound signal range of audibility

Answer 4

200m < - 2NM

75m<200m - 1.5NM

20m<75m - 1NM

20m> - 0,5NM

Question 5

What is a flashing light as defined by the colregs and not by iala

Answer 5

120 flash per minute

Question 6

Define a Flashing light

Answer 6

A light flashing at regular intervals at a frequency of 120 flash’s or more per minute