NAVIGATIONAL LIGHTS AND SIGNALS
INTRODUCTION
A power driven vessel had to use a number of light and signals
which are to used to indicate to the other ships whether the ship underway or at
anchor or not under command or even aground
Underway-when she had ropes running ashore. Also she is not in
anchor or aground.
Not under command generally when either the propeller, the engine,
or the rudder is not working satisfactorily.
There is a pattern in which these lights are set up on the ships and boats.
These lights work in such a manner that they can indicate an approaching ship about the
position of another ship in its path. By understanding the position and the angle of the lights
mentioned, the person at the helm (steering) of the opposite ship can clearly understand how
much change needs to be done in the ship’s route.
The visibility range of such lights varies between three miles to six miles. The lights that are used
for ships and bigger boats have a longer range of visibility as compared to the smaller boats.
There is also a concept known as all-round light that certain smaller boats can opt for. If a boat is
installed with an all-round light (it is a light fixed to the mast).
Navigation lights have specific
- Colour .
- Arc of illumination.
- Range of visibility.
Signals for a power driven ship underway
- Mast head light
There are two mast head lights (if the vessels length is less than 50
meters then there is only one light is used).
- Colour : White
- Arc of illumination:-Lights cover over 225°arc. 20 points on compass.
- Range of visibility:-atleast 6 nautical miles.
2. Side lights
- Colour:- Green light on starboard side and red light on port side.
- Arc of illumination:-Lights cover over 112.5° arc
about 10 points on arc.
- Range of visibility:-Visibility of these lights is at least 3 miles.
3. Stern lights
One stern light it is fixed in the right astern
- Colour:- White
- Arc of illumination:-covers an arc of 12 points on compass(135°).
- Range of visibility:-at least 3 miles.
By day no special light signals.
IN FOG:
If vessel is making way through water she can blow her whistle or siren one line blast of 4 to 6 seconds for an regular interval not
more than 2 minutes .
But if she is underway she can whistle or down two long blasts.
For a regular interval more than 2 minutes.
SIGNALS FOR A SHIP AT ANCHOR
At night:- a ship of 50 meter or more in length will have one white
light in the fore part of the vessel and second white light at a lower level
near the Stern. Both lights to be visible all round the horizon. visibility at
least 3 miles.
A ship of 100 metre or more in length at anchor will also have her
deck lights on.
By day:- All ships of any length should show in the fore part of the
vessel one black ball not less then 60 centimeter in diameter
In fog:- Every vessel at anchor should ring the anchor bell rapidly
for about 5 seconds at interval of not more than 1 minute a ship of more than
hundred meters in length shall in addition to the anchor bell also ring four
five seconds a gong at the stern immediately after the anchor bell.
SHIP NOT UNDER COMMAND
At night:-If not making way through water she shall show only two
red light one over the other at least 1.5 metres apart visible all around
Horizon for a distance of at least 3 miles.
By day:- She shall show 2
black balls from Bridge one over the other at least 1.5 apart
from each other and the diameter of the Black ball is not less than 60 centimeter
in diameter
In fog:- she shall sound at an intervals of not more than 2 minutes
one long and then short blasts.
SHIP AGROUND
At night:-When ship is aground she shall should show all anchor lights and
two all round red lights displayed vertically
By day:- she can show the Black ball one over the other at least 1.5
meter apart and each of not less than 60 cm in diameter.
In fog:- she shall give the fog signals for a vessel at anchor after
ringing the bell forward she shall give the separate and distinct strokes of
bell.
IMAGES
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| COLOUR OF LIGHTS USED AND THEIR POSITIONS IN SHIP |
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