Electronic Charts

Electronic charts are copies of paper charts. There are two types of electronic charts:

• Raster charts which are faithful reproductions of paper charts that have been scanned to produce the electronic copies. These will have the same datum as the paper chart scanned.

• Vector charts which are based on paper charts but enhanced to give 'added value' and if necessary have their datum changed so that all vector charts are WGS84 'compatible'.

• Electronic chart plotters use vector charts, so no correction is required.

• Personal computers may use either raster or vector charts, so the user needs to set or allow for the relevant map datum.

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