nautical issues :: iala maritime buoyage system
IALA Maritime Buoyage System
During the IALA conference in November 1980 two navigation marking systems, ie the System A (red colour for the left hand of the ship) and the System B (red colour for the right hand of the ship), were combined into one - the IALA System.
Following to the division into the IALA System regions, marine maps contain respective notice, ie the "IALA System Region A" or the "IALA System Region B".
In the Region B the colours are reversed, ie the red colour is used for the right side, and the green colour - for the left side.
When the path is divided on a fairway, then the direction of the main path is shown with a modified lateral buoy in order to indicate the direction of this main path.
Modified Lateral Buoys and Marks for the Region A
Modified Lateral Buoys and Marks for the Region B
Cardinal Buoys indicate that the deepest water occurs at the side of the mark’s name. They are placed to the north, south, east or west from the hazard. The cardinal buoys have mainly the shape of columns or poles. They are painted in horizontal, yellow and black stripes, and their topmarks (two cones) are painted black. The arrangement of cones at the top is an indication of the black stripe (or stripes) position on the buoy.
Cardinal buoys are equipped with white light characterised by a special rhythm. The main types of rhythms are as follows: flashing (Q) or fast flashing (VQ). The flashing light has 60 or 50 flashes per minute. The fast flashing light has 120 or 100 flashings per minute.
The lights in individual quadrants have the following characteristics:
The number of flashes - 3, 6 and 9, in the respective quadrants E, S and W facilitates the identification of the cardinal buoys, as the number can be associated with the positions of the 3, 6 and 9 hours on the clock dial. A longer flash (not less than 2 seconds) just after the VQ (6) or Q (6) is typical of the S quadrant. There are two other marks with white light, however, their rhythm is very different and cannot be confused with the rhythm of the white light used in the cardinal buoys.
Marks indicating Isolated dangers are placed directly over minor obstacles around which the water is navigable. The have shapes of columns, poles or other, however, they are difficult to confuse with the cardinal buoys. They are black with horizontal red stripes. The topmarks consists of two black spheres one above the other. The light is white - a group flash light Fl(2) with two flashes in a group.
Marks indicating Safe water. They indicate that water is navigable around the mark and they do not show any hazards. They can be used to mark, eg a fairway axis or as approach signs. The safe water marks appearance is completely different from the one of the buoys that indicate the hazard. Their may have a shape of a sphere, a column or a pole, with a red sphere as a topmark. These are the only marks painted in vertical stripes (red and white). When the light is installed, then its colour is white and its rhythm may be isophase, occulting, long flash or the Morse Code letter "A".
Special Buoys and Marks do not represent navigational aids. They indicate a special area or an object mentioned on maps or in other nautical documents and publications.
New danger. Attention is being drawn to the fact that a "new danger" that has not yet been announced in nautical documents may be indicated with a duplicating mark being identical (in all details) with the principal mark. The duplicating mark should stay until the news about the new danger has been adequately announced. The "new danger" mark should be equipped with a Racon sending out the letter "D" in the Morse Code.