Sector lights

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A typical sector light beacon on Kaasanmatala rock at the mouth of Kiiminkijoki in Haukipudas, Finland.
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A typical sector light beacon on Kaasanmatala rock at the mouth of Kiiminkijoki in Haukipudas, Finland.

Sector lights are a man-made pilotage and position fixing aid that indicates a safe channel through shallow or dangerous waters.

Generally, there are three lights of different colours, each identifying a sector:

  • white - this sector is inside the safe channel
  • red - indicates the port (nautical) side of the channel for incoming vessels
  • green - indicates the starboard side of the channel for incoming vessels


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