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Navigationalaids 150321005410 Conversion Gate01
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NAVIGATIONAL AIDSSUBMITTED BY: PATEL BHAVIK V. PATEL PARTH A. PATEL NIKUL I.
For safe , efficient economic and comfortable travel of vessels in rivers,channels harbours and along lake and ocean shores navigation aids are necessary
IMPORTANT OF NAVIGATIONAL AIDS
To avoid dangerous zones To follow proper harbour approaches To locate ports during night and bad
weather conditions
PUEPOSES
1)Fixed type: Light house Beacon lights Lights on piers 2)Floating type: Bouys Lightship
TYPES OF NAVIGATIONAL AIDS
Compels attention Permits time for easy response Commands respect Visibility distance
REQUIREMENTS OF SIGNALS
LIGHT HOUSE
They are all tower structure built of masonry or reinforced concrete.
Beacon light is provided. Tower is divided into number of floors. The tower should be strong enough to with
stand heavy wave action. Usually, they must have a visibility upto
30 km.
BEACON LIGHTS
Beacon light are fixed or flashing for easy identification by the navigator.
They are used for means of alignment or indicating changes of direction.
These are two types, 1)Buoys
2)Lightships 1)Buoys They are small sized floating structures,
generally in the form of large cylindrical cans and drums.
FLOTING NAVIGATIONAL AIDS
Buoys are of different types: Channel and entrance demarcation buoys Luminous buoys Audible buoys or bell buoys Mooring buoys
2)Lightships
In locations where it is not practical to build light houses, small ships displacing about 500 tones are used for the purpose.
The lantern is generally situated at about 9 to 12 m height above water levels.
The bulls of lightships are generally painted with red colour.
They are generally held in position by a single anchor.