8. Vector Chart Material
8-3
Cell name:
Name of chart.
Navigational purpose:
S57 charts are compiled for a variety of navigational purposes.
The navigational purpose, for which an individual S57 chart
has been compiled by a Hydrographic Office, is indicated in
this field. Alternatives are: Overview, General, Coastal,
Approach, Harbour and Berthing.
Issue date:
Issue date of the Base cell of the chart.
Edition number:
Edition number of the chart.
Last displayed update:
Number of last update, which is visible on the chart screen.
Update issue date:
Issue date of last update, which is visible on the chart screen
Last update appl. date:
Date to which the last update, which is visible on the chart screen, is effective.
Projection:
Projection of the chart. The projection is always Mercator.
Horizontal datum:
Horizontal datum of the chart data as published by the chart producer. By definition this must be WGS 84.
Vertical datum:
Vertical datum of the chart.
Sounding datum:
Datum used for soundings.
Quality of data:
Quantitative estimate of the accuracy of chart features, given by the chart producer.
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