Raster chart display system.
Related Terms |
HEIGHT OF TIDE
Vertical distance from the chart sounding datum to the water surface at any stage of the tide. It is positive if the water level is higher than the chart sounding datum. The vertical distance from the chart sounding datum to a high water datum is called RISE OF TIDE.
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INDEX CHART
An outline chart showing the limits and identifying desig- nations of navigational charts, volumes of sailing directions, etc.
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NATIONAL WATER LEVEL OBSERVATION NETWORK
A network composed of the primary control tide stations of the National Ocean Service. This network of coastal observation stations provides the basic tidal datums for coastal boundaries and chart datums of the United States. Tidal datums obtained at secondary control tide stations and tertiary tide stations are referenced to the Network.
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ENC
Electronic Navigational Chart
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RNC
Raster Navigational Chart
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ISOGRIV
A line drawn on a map or chart joining points of equal grivation
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ISOGRAM
That line, on a chart or diagram, connecting points of equal value of some phenomenon
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ISOPORIC CHART
A chart with lines connecting points of equal annual rate of change of any magnetic element
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ISOGRIV CHART
A chart showing isogrivs
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LARGE SCALE
A scale involving a relatively small reduction in size. A large-scale chart is one covering a small area. The opposite is SMALL SCALE.
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