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21-675: The North Bank or Northbank Lighthouse , is an active aid to navigation located at the mouth of the River Liffey , near Dublin , Ireland. It is one of four lighthouses that help guide shipping into the Liffey, and the Port of Dublin , all of which are operated and maintained by the Dublin Port Company . Built in 1882, it also affectionately called The Tea Caddy due to its architecture, and has also been described as "resembling

42-420: A channel divides the mark at the junction is called a "preferred channel mark" or "junction buoy". The mark has the colour and shapes corresponding to the preferred channel with a band of the other colour to indicate it is the other hand mark for the subsidiary channel. In IALA region A where a minor channel branches off to port the mark at the junction would be a red cylinder with a green band. The red cylinder

63-679: A display as a part of the lead up to the Red Bull Cliff Diving World Series competition that took place on Inishmore in June of that year. Operated by the Dublin Port Company, it is registered under the international Admiralty number A5886 and it has the NGA identifier of 114–6632. With a focal height of 10 metres (33 ft) above sea level, the light can be seen for 16 nautical miles. Its characteristic

84-467: A giant mailbox on stilts". Completed in 1882, the green lighthouse consists of a square tower with a lantern room and gallery, which is supported by a series of concrete columns. This gives an overall height of 11 metres (36 ft). It is located midway between the end of the North Bull Wall , and Alexandra Quay and the main port. The other lighthouses for the port are Poolbeg at the end of

105-400: A partial reversal of colours. Then Poolbeg light was painted black, North Bull had a red tower and North Bank showed an occulting white light from a "tower, painted with red and white bands". Although the fog bell at North Bank is now disused, in 1923 it was still operational, along with other bells at North Bull and North Wall Quay, whereas Poolbeg had a fog siren. A large scale replica of

126-399: A ship into a safe place") and lights are fixed markers that are laterally displaced to allow a mariner to navigate a fixed channel along the preferred route. They are also known as "channel markers". They can normally be used coming into and out of the channel. When lit, they are also usable at night. Customarily, the upper mark is up-hill from the lower (forward) mark. The mariner will know

147-458: A single red sphere for a top mark. It indicates that there is safe water all around it. The usual use is to indicate the start of a channel or port approach. Indicates a newly discovered or created danger that is not yet marked on charts (or in update notices thereto). The mark is used for a short time until the danger is either removed or else marked conventionally with lateral or cardinal marks. The mark has blue and yellow vertical stripes and

168-401: A yellow and blue light. The topmark is a vertical yellow cross. Yellow with an "X" topmark. Used to mark other features such as swimming areas, anchorages, pipelines. The exact reason is marked on charts. A sector light is one which shows different colours depending upon the angle of approach. They are commonly used to indicate the safe channel (white) and show red or green if the vessel

189-426: Is a sea mark (a buoy or other floating or fixed structure) commonly used in maritime pilotage to indicate the position of a hazard and the direction of safe water. Cardinal marks indicate the direction of safety as a cardinal ( compass ) direction ( north , east , south or west ) relative to the mark. This makes them meaningful regardless of the direction or position of the approaching vessel, in contrast to

210-425: Is a port hand mark for the main channel, the green band indicates a starboard mark for the minor channel. In IALA region B the colours (but not shapes) are reversed. Cardinal marks warn of a danger (wrecks, shoals, bends, spits etc.) and indicate the safe water past the danger. There are four varieties: north, east, south and west. A north cardinal mark is placed to the north of a hazard and indicates safe water

231-545: Is an occulting green light, which is lit for seven seconds and eclipsed (or dark) for one second. Aid to navigation According to the glossary of terms in the United States Coast Guard Light list , an aid to navigation (ATON) is any device external to a vessel or aircraft specifically intended to assist navigators in determining their position or safe course, or to warn them of dangers or obstructions to navigation. Lateral marks indicate

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252-556: Is either cylindrical or conical as appropriate. IALA divides the world into two regions: A and B. Region B is the Americas (excluding Greenland) along with Japan, Korea and the Philippines. Region A is the rest of the world. In region A port marks are red and starboard marks green. In region B port marks are green and starboard red. Where marks are numbered red marks have even numbers and green marks have odd numbers. Where

273-646: Is out of the safe channel. IALA requires the light colours to follow the appropriate region (A or B) colour scheme. There are also other markers that give information other than the edges of safe waters. Most are white with orange markings and black lettering. They are used to give direction and information, warn of hazards and destructions, mark controlled areas, and mark off-limits areas. These ATONs do not mark traffic channels. On non-lateral markers, there are some shapes that show certain things: AtoNs can be integrated with automatic identification system (AIS) . AIS transmitted form an actual aid (buoy, lighthouse etc.)

294-580: Is termed a "real AIS AtoN". If it is impractical to equip the AtoN with an AIS transponder an AIS shore station can be assigned to transmit AIS messages on behalf of the AtoN. This is known as a "synthetic ATON". Synthetic AtoNs can be either "monitored synthetic AtoNs" or "predicted synthetic AtoNs". The former have a link between the AtoN so that the AIS station can confirm the AtoNs status. The latter have no link and

315-404: Is to the north of the mark. East, south and west are placed accordingly. Cardinal marks are yellow and black with two cones at top marks. There is no difference between IALA region A and B. Black with a horizontal red band and two black balls as a top mark. The mark indicates a danger (shoal, rock, wreck etc.) which is isolated with safe water all around. Red and white vertical stripes with

336-672: The Great South Wall , North Bull at the end of the North Bull Wall, and North Wall Quay Lighthouse at the entrance to the Alexandra Basin. These lights and the various buoys at the side of the channel follow the convention of green on the right (starboard) and red on the left (port) when entering the dredged channel. The 1923 edition of the British Pilot shows that this has not always been the case, with

357-530: The (perhaps better-known) lateral mark system. The characteristics and meanings of cardinal marks are as defined by the International Association of Lighthouse Authorities . A cardinal mark indicates one of the four compass directions by: Either a quick or a very quick sequence of light flashes may be used; the choice allows for two similar nearby marks to be uniquely identified by their lights. A cardinal mark may be used to accomplish

378-439: The AIS system just predicts that the AtoN is where it should be. If there is no real AtoN (such as for the short term marking of a wreck) then a "virtual AIS AtoN" is used. Each AIS AtoN must have a unique Maritime Mobile Service Identity ( MMSI ) number. Synthetic and virtual AIS AtoNs mark their messages as repeats to indicate that the location of the transmitter is not the location of the AtoN. Lead marks (as in "leading

399-404: The edge of the channel. The standards are defined by the International Association of Marine Aids to Navigation and Lighthouse Authorities (IALA). Approaching harbour port a vessel leaves port hand marks to port (left) and starboard hand marks to starboard (right). Port hand marks are cylindrical, starboard marks are conical. If the mark is a pillar or spar shape, then a topmark is fitted which

420-578: The geometry of the marks/lights from the navigational chart and can understand that when "open" (not one above the other) the ship needs to be navigated to "close" the marks (so one is above the other) and be in the preferred line of the channel. In some cases, the lead marks/lights are provided by lasers, as in the laser channel under the Tasman Bridge on the Derwent River at Hobart , Tasmania . Cardinal mark A cardinal mark

441-601: The lighthouse complete with a working green light was built by artist Fergal McCarthy inside the Science Gallery at Trinity College, Dublin in 2015. It was part of the Home/Sick exhibition, McCarthy having been "fascinated for several years by the sight of the Northbank Lighthouse at the mouth of the Liffey estuary". In 2017, the lighthouse was used as a diving platform by cliff divers who put on

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