The leading lights of IJmuiden.

WL-146-85468
On board of the bulk carrier ‘Cape Kennedy’, length 229 meters and width 32 meters  pilot Leen Kranendonk gives instructions to follow a pair of leading lights marking the IJgeul (the entrance on the North Sea to the North Sea Canal). The 24-metre high lighthouse together with the low lighthouse of IJmuiden forms the leading lights. The lights are a pair of light beacons, used in navigation to indicate a safe passage for vessels entering a shallow or dangerous channel and may also be used for position fixing. At night, the lights are a form of leading line that can be used for safe navigation. The beacons consist of two lights that are separated in distance and elevation, so that when they are aligned, with one above the other, they provide a bearing. Range lights are often illuminated day and night. Two lights are positioned near one another. One, called the front light, is lower than the one behind, which is called the rear light. At night when viewed from a ship, the two lights only become aligned vertically when a vessel is positioned on the correct bearing. If the vessel is on an incorrect course, the lights will not align..

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