Lights -Theory Flashcards
Where is a masthead light placed on a vessel?
Over the fore + Aft of the centreline
What are the specs of a Masthead light?
Unbroken arc - 225 degrees
Right ahead to 22.5 degrees abaft her beam
What is a sidelight? What are its specs?
Green Light STBD
Red light PORT
Unbroken Light - 112.5 degrees
22.5 degrees from either side
Each showing an unbroken arc of 112.5 Degrees so as fixed as to show the light from right ahead to 22.5 degrees abaft her beam on the respective side.
Vessels Under 20m may have a combined side light in one lantern
What is a sternlight? what are its specs?
Unbroken Light - 135 degrees
67.5 degrees from aft either side
White light placed as nearly practicable at the stern showing an unbroken light over the horizon of 135 degrees
and so fixed as to show the light from 67.5 degrees from right aft on each side of vessel
What is a towing light? what are its specs?
Yellow light with same characteristics as a stern light
Unbroken Light - 135 degrees
67.5 degrees from aft either side
What is an all round light?
Unbroken arc of 360 degrees over the horizon
What is a flashing light interval?
Flashing at regular intervals of 120 or more per minute
What is the range of a masthead light of a vessel 50+ metres in length?
+ Arc of vis?
6 Miles
Arc of vis 225 (20 points)
What is the range of a Sidelight of a vessel 50+ metres in length?
+ Arc of vis?
3 Miles
Arc of vis 112.5 (10 points)
What is the colour/ range of a Sternlight of a vessel 50+ metres in length?
+ Arc of vis?
Colour - White
Range- 3 Miles
Arc 135 (12 Points)
For a vessel 50+ metres in length
What is the Range of
-Masthead light
-Sidelight
-Sternlight
-Towing light
-White, red, green or yellow all round white light
50+ metres Ranges
-Masthead light
6 miles
-Sidelight
3 miles
-Sternlight
**3 miles **
-Towing light
3 miles
-White, red, green or yellow all round white light
3 miles
For a vessel 12+ metres in length but less than 50m
What is the Range of
-Masthead light
-Sidelight
-Sternlight
-Towing light
-White, red, green or yellow all round white light
12+ metres in length but less than 50m
Ranges
-Masthead light -
5 miles (unless less than 20m - 3 miles)
-Sidelight
2 miles
-Sternlight
2 miles
-Towing light
2 miles
-White, red, green or yellow all round white light
2 miles
For a vessel less than 12 metres in length
What is the Range of
-Masthead light
-Sidelight
-Sternlight
-Towing light
-White, red, green or yellow all round white light
less than 12m
Ranges
-Masthead light
2 miles
-Sidelight
1 mile
-Sternlight
2 miles
-Towing light
2 miles
-White, red, green or yellow all round white light
2 miles
A PDV underway shall exhibit
Under 50 metres
50+ metres
Mastheadight FWD
A second Mast headlight Abaft of and HIGHER than the FWD one except vessels less than 50m not obliged but may do so
sidelights
sternlights
What light does an Air cushioned vessel display?
All round flashing yellow light
What lights shall an inconspicuous, partly submerged vessels or objects being towed show?
Light and range
a white all-round light, 3 miles.
A WIG craft only when taking-off, landing and in flight near the surface shall Exhibit
a masthead light forward
a second masthead light abaft of and higher than the forward one; except
that a vessel of less than 50 metres in length shall not be obliged to exhibit
such light but may do so;
(iii) sidelights;
(iv) a sternlight.
+ a high intensity
all-round flashing red light.
What light does a power-driven vessel of less than 12 metres in length display?
an all-round white light
and
sidelights;
A power-driven vessel when towing shall exhibit:
&
When the length of the tow, measuring from the
stern of the towing vessel to the after end of the tow exceeds 200 metres??
two masthead lights in a vertical line.
When the length of the tow, measuring from the
stern of the towing vessel to the after end of the tow exceeds 200 metres,
three such lights in a vertical line;
sidelights;
a sternlight;
a towing light in a vertical line above the sternlight;
when the length of the two exceeds 200 metres, a diamond shape where it
can best be seen.
A sailing vessel underway shall exhibit:
sidelights;
sternlight
May be combined at the top of the mast, where can best be seen
A sailing vessel of less than 7 metres in length shall exhibit the following lights
sidelight
sternlight
but if she does not, she shall
have ready at hand an electric torch or lighted lantern showing a white light which
shall be exhibited in sufficient time to prevent collision
A vessel engaged in fishing, whether underway or at anchor, shall exhibit only the
lights and shapes prescribed in this Rule.
GREEN
WHITE
two all-round lights in a vertical line, upper being green and the lower
white,
a masthead light abaft of and higher than the all-round green light; a vessel
of less than 50 metres in length shall not be obliged to exhibit such a light
but may do so
when making way through the water, in addition to the lights prescribed in
this paragraph, sidelights and a sternlight.
A Vessel NUC shall exhibit
(i) two all-round red lights in a vertical line where they can best be seen
(ii) two balls in a line (day)
Making way - sidelights and a sternlight.
You see Sidelights + Sternlight on a vessel? what does this mean?
This is showing that the vessel is making way
What is the distance between the two black balls
Dayshape; NUC
At least 1.5M
What is the range of the two round red lights of a vessel NUC ?
- 50+m
& - Under 50m
50+m
3 miles
&
Under 50m
2 miles
What height above the hull must the red lights from a NUC vessel over 20m vessel be?
No less than 4 metres above the hull
& 2m above the gunwhale for vessels less than 20m
A vessel RAM except a vessel engaged in mine
clearance operations, shall exhibit:
(i) three all-round lights in a vertical line where they can best be seen. The
highest and lowest of these lights shall be red and the middle light shall be
white;
(ii) three shapes in a vertical line where they can best be seen. The highest and
lowest of these shapes shall be balls and the middle one a diamond;
(iii) when making way through the water, masthead light or lights, sidelights
and a sternlight, in addition to the lights prescribed in sub-paragraph (i);
What is the range of the RED lights of a vessel RAM?
2 miles
What is the range of a vessel RAM sternlight?
2 or 3 miles depending on the size of vessel
What is the range of a RAM’s anchor light, vessel less than 50m
2 miles
A vessel engaged in underwater operations has green lights on the side free of obstruction, what is the range of these?
2 or 3 miles depending on size of vessel
How far should you steer away from a minesweeper?
1000m
A minesweeper has diamonds on one side and balls on the other side, which is the obstructed side?
How far apart do the balls have to be?
The side with the balls is obstructed
Balls - Not less than 1.5m apart
You see a vessel at anchor, size = less than 50m
what is the range of the anchor light?
2 miles
what is the diameter of an anchor ball shape?
Diameter = not less than 0.6m
A vessel at anchor, size = more than 50m
What is the range of these lights?
How far above the hull does the Aft anchor light have to be?
Range 3 miles
Fwd anchor light - not less than 4.5m above the
Aft anchor light= no less than 6m above the hull
A vessel aground under 50m, what is the range of the red lights?
2 miles
A vessel aground under 50m, what is the range of the All round white light?
2 miles
A vessel aground over 50m, what is the range of the red lights?
3 miles
A vessel aground over 50m, what is the range of the All round white light?
3 miles
a vessel intending to overtake another vessel to stbd shall
two prolonged blasts followed by one short blast
to mean ‘I intend to overtake
you on your starboard side’;
a vessel intending to overtake another vessel port shall
two prolonged blasts followed by two short blasts
What sound must a vessel sound to agree the overtake?
one prolonged, one short, one prolonged and one short blast
How wide must a black ball be? Vessel 20+metres
No less than 0.6m
A vessel 20+ metres has two black balls for NUC, how far apart must these balls be?
No less than 1.5m apart
A vessel 20+ metres What is the width/height of the diamond?
No less than 0.6m
Height 2x diameter
A vessel 20+ metres What is the width/height of the diamond?
No less than 0.6m
Height 2x diameter
What flag shall a fishing vessel display when;
Shooting nets
Zulu
What flag shall a fishing vessel display when;
Hauling nets
Golf
What flag shall a fishing vessel display when;
Nets made fast
Papa
