English

The production of a new or revised map or chart, or portions thereof, from existing maps, aerial photographs, surveys, new data and other sources or the selection, assembly, and graphic representation of all relevant information required for the preparation of a map or chart.

The Chart Evaluations Surveys (CES) program is designed to: 1. Resolve all deficiencies reported or discovered. (A deficiency is defined as charted information that can be made more complete through field examination, or information which should be charted but is not.) 2. Evaluate the adequacy/accuracy of hydrographic information on existing charts. 3. Verify or revise information published in the appropriate Coast Pilot. 4. Conduct user evaluation and public relations efforts to provide an awareness of products and obtain user input.

A small auxiliary CHART giving new details on a particular area, to be added to the CHART after publication. Also calledblock correctionorchart amendment patch. A small CHART, such as one showing the coverage area of electronic navigational systems, with the distribution of its LINES OF POSITION, CORRECTIONS to be applied to readings, location and identification of TRANSMITTERS, etc.

Interpretation of the symbols, lines, abbreviations, and terms appearing on charts. May be called map reading when applied to maps generally.

The tidal datum to which soundings and drying heights on a chart are referred. It is usually taken to correspond to a low water stage of the tide. Often shortened to CHART DATUM, especially when it is clear that reference is not being made to a horizontal datum.

A character, letter, or similar graphic representation used on a chart to indicate some object, characteristic, etc. May be called map symbol when applied to any map.

The total amount in GRAMS of chlorine, bromine and iodine contained in one KILOGRAM of SEA WATER, assuming that the bromine and the iodine had been replaced by chlorine. See SALINITY.