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 | | It was the spread of the compass that assisted the creation of the portolan as a new type of nautical chart in the 13th century, and it was the growing role of improved instruments of celestial navigation, coupled with the different demands of the rapidly expanding oceanic voyages, that made it obsolete several centuries later. |
 | | This did not happen overnight, for the portolan chart was used in the Atlantic in the 15 th century and spread over the world's oceans in the 16th, 6th, being the type adopted and given a new dimension by the earliest discoverers themselves, with the Portuguese far in the vanguard. |
 | | In contrast to portolan texts, those of the isolarii focused on the topical and historical aspects of a given island and paid only marginal attention to navigational matters, for their purpose was not to help the mariner but to amuse and instruct the curious reader. |
| coursesa.matrix.msu.edu /~fisher/hst373/readings/soucek.html (6116 words) |
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