There are two basic factors that lead to the unusual properties we end up with on the presentation of the ENC-I am not discussing the content of the charts at all here, just the issues of size, shape, boundaries, and scales.įirst, the US ENC are made from the available RNC. Since then I have made progress on understanding these ENC properties, thanks primarily to good support from NOAA's Office of Coast Survey (OCS), who do indeed care about the best use and understanding of their products. In short, that note just described the situation without providing any reasons for it. There were several questions raised in that note that have taken more research. This is not at all the case when we move to the vector ENC charts. The latter are echarts made from exact graphic copies of the paper charts, and in that sense their sizes, boundaries, names, and scales are immediately understandable to anyone familiar with the paper charts. In a recent article ( The Strange World of Electronic Chart Boundaries) I pointed out the unusual nature of the shapes and names of electronic navigation charts (ENC), which are the digitized vector versions of the raster navigation charts (RNC).
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