Appendix 4: C-MAP CM-93/3 Charts
AP-27
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.
Magnetic var.:
Amount of magnetic variation. A positive value indicates a change in an easterly direction and a negative value
indicates a change in a westerly direction.
Depth:
Unit of measurement for depth.
Height:
Unit of measurement for height above sea level (for example, clearance height).
A4.3.2 Choosing CM93/3 chart material to use
To activate S57 chart material onto the display, do the following:
1. Place the cursor just above the chart scale indication in the information area.
2. Activate S57 Chart appears in the mouse functions area; push the left mouse button.
A4.3.3 Choosing charts for viewing
Choosing a chart from a catalogue
To choose a chart for viewing from a catalogue, do the following:
1. Choose Chart Catalogue from the Chart menu.
2. From the Chart Catalogue dialog box, use the cursor to choose desired chart.
3. Click the Open button.
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