Comparision between Raster And Vector Charts
Privately produced vector charts |
Official Raster (RNCs) |
ENCs |
Generally a copy of the paper chart | An exact replica of the paper chart | All data merged into cells |
A different image to the original paper chart is presented at all levels of zoom and scale | The same image as the paper chart is always presented. The chart is more equivalent to the paper chart than any vector chart including ENCs | No resemblance to the paper chart |
Symbols and colour vary with manufacturer. | Symbols and colour are the same as the paper chart equivalent. | The IHO publication S-52 defines new colours and symbols for ENCs. |
Accuracy, reliability and completeness vary with manufacturer | ENCs should be more accurate and reliable than the paper version. | A new operational regime is required |
A new operational regime is required | The same operational regime as paper charts is followed. | A new operational regime is required |
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