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OOW3000 Yachts Oral Study > Lights & Shapes > Flashcards

Lights & Shapes Flashcards

1
Q

What is a “Masthead light”

A

White light
Placed on the fore and aft centreline
Showing an unbroken light over an arc of the horizon off 225°
Fixed as to show the light from right ahead to 22.5° abaft the beam on EITHER side of the vessel.
Range:
6nm 50m+
5nm 20m-50m
3nm 12m-20m
2nm <12m

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2
Q

What is a “sidelight”

A

Red or green light
Showing an unbroken light over an arc of the horizon of 112.5 degrees
Fixed as to show the light from the right ahead to 22.5 degrees abaft the beam on its RESPECTIVE side.
Range:
3nm 50m+
2nm 12m-50m
1nm <12m

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3
Q

What is a “sternlight”

A

White light
Placed as nearly as practicable at the stern
Showing an unbroken light over an arc of the horizon off 135°
Fixed as to show the light 67.5 degrees from right aft on each side of the vessel.
Range:
3nm 50m+
2nm 12m-20m
2nm <12m

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4
Q

What is a “towing light”

A

Yellow light having the same characteristics as the “sternlight”
Range:
3nm 50m+
2nm 12m-20m
2nm <12m

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5
Q

What is a “All-round light”

A

Light showing an unbroken light over an arc of the horizon of 360 degrees.
Range:
3nm 50m+
2nm 12m-50m
2nm <12m

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6
Q

What is nominal range?

A

The minimum range of a light when the visibility is 10nm

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7
Q

What is a “manoeuvring light”

A

All-round white light
Minimum range of 5 miles
Shall be placed in the same fore and aft vertical plane as the masthead light or lights
Minimum height of 2 metres vertically above the forward masthead light

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8
Q

What is a “flashing light”

A

Light flashing at regular intervals at a frequency of 120 flashes or more per minute.

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9
Q

What colour should shapes be?

A

Black

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10
Q

What is the characteristics of a ball?

A

Diameter atleast 0.6m

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11
Q

What is the characteristics of a cone?

A

Base diameter of not less than 0.6 metre and a height equal to its diameter

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12
Q

What is the characteristics of a cylinder?

A

Diameter of at least 0.6 metre and a height of twice its diameter

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13
Q

What is the characteristics of a diamond?

A

Shall consist of two cones having a common
base.

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14
Q

What is the vertical distance between shapes?

A

Shall be at least 1.5 metres

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15
Q

What is the vertical distance between two masthead lights?

A

Shall be at least 4.5 metres

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16
Q

What is the vertical distance between all round lights in special circumstances?

A

Shall be at least 2m
when three lights are carried they shall be equally spaced

17
Q

Lights for a vessel over 100m at anchor?

A

2 all round white lights plus deck lights

18
Q

Lights for a vessel over 50m at anchor?

A

2 all round white lights

OOW3000 Yachts Oral Study (46 decks)

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