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== Electronic Charts ==
An individual electronic chart, or, more commonly, a database of charts, is the heart of a chartplotter. The chartplotter system can be no more accurate than its charts.
Without charts that are accredited by appropriate governmental organizations, a chartplotter is an example of an Electronic Charting System (ECS). When the charts meet the technical requirements of the [[International Maritime Organization]] (IMO) and national hydrographic bodies, the chartplotter can qualify as an [[Electronic Chart Display and Information System]] (ECDIS). ECDIS legally can be substituted for paper charts while navigating in active waterways, but vessels are required to maintain paper charts if their chartplotter does not use ECDIS.
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