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The main components of VMS are the department's centralized database, tracking devices, and ArcGIS. Whether at the department, in the harbor office, or on a boat, an inspector can access the GIS to track a vessel and get information about its owner, type, and gear on board and a host of other information.
The Nantucket Harbor Range Lights are range lights that were built in 1908 to guide vessels through the narrow channel to Nantucket Harbor. They replaced an older arrangement involving the Nantucket Beacon and the Brant Point Light , which became unusable when the latter was replaced with a new tower.
The higher rear light is placed behind the front light. When the mariner sees the lights vertically in line, he is on the range line. If the front light appears left of the rear light, the observer is to the right of the range line; if the front appears to the right of the rear, the observer is left of the range line."
Channel Islands Harbor is a small craft harbor [2] and shore-protection project [3] in Oxnard, California at the southern end of the Santa Barbara Channel. It is the fifth largest harbor for small-craft recreation in the state of California [ 4 ] and is a waterfront resort, recreation, and dining marketplace.
Customarily, the upper mark is up-hill from the lower (forward) mark. The mariner will know 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.
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 ...