They are typically smaller in file size, so that more regional coverage can be provided on a single chip.
Since a human cartographer is not involved in creating the image, they often lack the nuance of paper charts and can look quite plain. Vector charts are databases of chart objects (soundings, shorelines, navigational aids, etc.) that are assembled into a screen image on the fly by the chartplotter. The traditional look and feel of raster charts may also reassure those easing into electronic charts. They are typically larger in file size and lack features like configurable depth units, on/off map information layers and other advanced functionality found in vector charts. Raster charts are scanned images of paper charts and are familiar to most everyone. In selecting electronic charts, you should decide whether you prefer raster or vector charts, or if you want to use both.
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Several chart manufacturers reformat government electronic charts to work on their hardware, and numerous PC and tablet charting programs can display NOAA chart files directly. NOAA, for instance, offers more than 1,000 U.S. The hydrographic offices of several countries, like the National Oceanic Atmospheric Administration (NOAA) in the United States, share their data freely and also give away electronic versions of their paper charts.
It is important to understand that commercial chart suppliers usually license chart data from authorized government hydrographic offices that also produce paper charts.
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