LATERAL MARKS (REGION A)

Hello guys, today we will talk about another part of IALA Maritime Buoyage System. Here we will identify the details of the buoys identified in the previous part.

1) LATERAL MARKS

 Lateral marks are generally used for well-defined channels in conjunction with a Conventional Direction of Buoyage. They indicate the port and starboard hand sides of the route to be followed.

Direction of buoyage 

The Conventional Direction of Buoyage is defined in one of two ways:

 Local Direction of Buoyage. The direction taken by the mariner when approaching a harbour, river, estuary, or other waterway from seaward; 

General Direction of Buoyage. The direction determined by the buoyage authorities, based wherever possible on the principle of following a clockwise direction around continents. It is usually given in Admiralty Sailing Directions and, if necessary indicated on charts by the appropriate symbol.

Region  A

This diagramn is schematic and in the case of pillar buays in particular, their features will vary with the individal design of the buoys in use.

port hand

Colour :- red

Shape :- Can,Pillar or spar

Top mark (when fitted) :- Single red can

Rectroreflector :- Red band or  square

Starboard

Colour:- Green.

Shape:- Conical, pillar or spar. 

Topmark (when fitted):- Single green cone point upward. 

Retroreflector :- Green band or triangle.

Lights :when fitted, may have any rhythm other than composite group flashing (2+1) used on modified Lateral marks indicating a preferred channel. Examples are:

The lateral colours of red or green are frequently used for minor shore lights, sach as those marking pierheads and the extremities of  jetties.

PREFERRED CHANNELS 

At the point where a channel divides, when proceeding in the conventional direction of buoyage, a preferred channel is indicated by

Preferred channel to starboard 

Colour: Red with one broad green band. 

Shape: Can, pillar or spar. 

Topmark (when fitted): Single red can. 

Retroreflector: Red band or square.

Preferred channel to port 

Colour: Green with one broad red band. 

Shape: Conical, pillar or spar. 

Topmark (when fitted): Single green cone point upward. 

Retroreflector: Green band or triangle.

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