Cartographic representations of the Adriatic Sea basin on 11 (manuscript and printed) Early Modern Age nautical charts, made between 1538 and 1771, were subjected to a cartometric analysis in which their geometrical features were inspected. Additionally, four of them on which the graticules were plotted and were subjected to the analysis of their spherical coordinates, which was conducted in parallel. The results show that cartographers who produced printed charts in seventeenth and eighteenth centuries, never succeeded in surpassing the geometric accuracy of manuscript portolan charts from the sixteenth century, regardless of whether their charts contained graticules or not. According to the results and the historical context of contemporary technological development, it appears that in the era that preceded systematic hydrographic surveys, their authors had no other choice but to (partially) copy the inherited ‘framework’ of portolan charts as a reference model, and to implement certain localized trial and error modifications.
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