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RNC

Raster Navigational Chart

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.

INDEX CHART

An outline chart showing the limits and identifying desig- nations of navigational charts, volumes of sailing directions, etc.

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.

ENC

Electronic Navigational Chart

ISOGRIV

A line drawn on a map or chart joining points of equal grivation

ISOGRAM

That line, on a chart or diagram, connecting points of equal value of some phenomenon

ISOPORIC CHART

A chart with lines connecting points of equal annual rate of change of any magnetic element

ISOGRIV CHART

A chart showing isogrivs

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.

CHART

A map for use by navigators.
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