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date: 19 October 2019

portulan, or portolan, chart. 

Source:
The Oxford Companion to Ships and the Sea
Author(s):
Mike RicheyMike Richey

This derived its name from port books. It was not only the first sea chart but the first true map of any kind for, based on measurement, it was intended for use rather than display or illustration. Unlike contemporary land maps where size might, for instance, be related to importance, it carried a scale. The earliest surviving example is the ... ...

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