Coloured sector lights are often used on the approach to a port or harbour to indicate dangerous areas. Typically, if the vessel is in the white sector, it is in safe water. If the colour, as seen from the vessel, changes to red or green, it implies the vessel may be running into danger.

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Wide-angle sector lights allow a navigator to see at a glance which sector they are in relative to the light. They are used where a navigator does not need to know precisely where they are, just which sector they are in.

Where the vessel needs to be precisely positioned within a channel, a pair of leading marks can be used to define the line that the vessel should follow. Leading marks usually consist of a daymark structure large enough to be seen at the required distance in daylight, with lights only for night-time — although daymarks are sometimes lit during the day for added emphasis. If flashing lights are being used, then synchronising these can be an effective way of making them stand out.

There are also situations where a pair of leading marks is impractical and costly. In this case, precision sector lights allow a narrow channel to be defined by just one light.

Hydrosphere supplies a range of wide-angle sector lights, leading marks and precision sector lights to mark out boundaries at restricted approaches accurately.

For additional information, please contact Hydrosphere to discuss your requirements.