File:Portolan grid (construction).jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:12, 24 June 2011 | ![]() | 1,235 × 902 (602 KB) | Walrasiad | {{Information |Description=Illustration of the construction of the compass or rhumb line grid typical of portolan charts, on the anonymous Genoese nautical chart (c.1325-50) held by the Library of Congress, Washington DC. |Source=*[[:File:Mediterranean_ch |
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