IALA buoyage system provides six types of marks: Cardinal marks are used in conjunction with the compass to indicate where the mariner may . IALA maritime buoyage system has helped to overcome these difficulties to a. different regions IALA have created a worldwide buoyage system. Region A Cardinal Marks: indicate the position of a hazard and the direction of safe water. the use of either Cardinal marks or Lateral marks but . Within the Maritime Buoyage System there are six types of marks, which may be used alone or in.

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Coloured beacon other than green and black, the symbol is again filled black so only the shape of the topmark is of navigational significance.

Sgstem colours in vertical or diagonal stripes, the darker colour is given first. Red beacon and green buoy with topmark, colour, radar reflector and designation.


Red buoys and marks are given even numbers, green buoys and marks are given odd ssystem. The black symbol indicates a true radar reflector. Other radar-conspicuous objects – natural or manmade – which are known to give an unexpectedly strong radar response may be distinguished by the magenta symbol.

Wave-actuated bell buoy to the left, and to the right a Light buoy, with a horn giving a single blast every 15 seconds, in conjunction with a careinal whistle. The fog signal symbol may be omitted when a description of the signal is given. Leading beacons – Leading line firm line is the track to be followed.

Canada’s Buoyage System – CCG – Aids to Navigation

Bearing given in degrees and minutes. The lights are synchronized. The red light has a shorter nominal range the distance from which the light can be seen: Maros light on multi-coloured charts.

The elevation is 21 metres height of the light structure above the chart datum used narks elevations. The nominal range of the white light is 18 nautical miles. The range of the green and red light is 12 nautical miles.


Main light visible all-round with red subsidiary light seen over danger. The fixed red light has an elevation of 55 metres and a nominal range of 12 nautical miles.

Navigation Buoys and Markers – IALA Buoyage System

The flashing light is white, with three flashes in a period of 10 seconds. The elevation is higher than the red light: Symbol showing direction of buoyage where not obviouson multi-coloured charts red and green circles coloured as uboyagehere IALA A. Meteorological Optical Range Table. Dipping distance or range.

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