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Leading lights, also known as range lights in the United States, are a pair of light beacons used in navigation [2] to indicate a safe passage for vessels entering a shallow or dangerous channel; they 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 ...
Initially the plan was to use screw-pile lighthouses (shore lights were never considered); ice in the winter of 1872–1873 led them to reconsider this, and the front light was built as a small caisson structure. For the rear light a grid of nine stone piers was laid out, and a pyramidal iron tower was erected.
The range marked by these lights formed part of a three-leg channel leading from the ocean. Prior to dredging there were two main routes: a southern route past Boston Light and through the narrows south of Lovells Island , and a northern route entering from Broad Sound past Deer Island and across President Roads .
The ship is navigating in the safe sector (white light is commonly marked as yellow in nautical charts). [2] A sector light is a man-made pilotage and position fixing aid that consists of strictly delineated horizontal angle light beams to guide water-borne traffic through a safe channel at night in reasonable visibility. Sector lights are most ...
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