A small chart or map, typically used for reference or navigation purposes.
From chart (from Old French carte, from Latin charta meaning 'paper') + -let (a diminutive suffix meaning 'small'). The suffix became productive in English to create smaller versions of objects.
Chartlet shows how English loves making tiny versions of things—we do it with pig/piglet, book/booklet, and even islands/islets. Medieval sailors probably used these mini-charts for quick reference without unrolling massive navigation documents.
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