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Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, and names of coastal settlements, all to aid navigation. With a colourful compass rose.

This colourful hand-drawn portolan (nautical) chart was designed to aid navigation. It features a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, anchor points and written notes.

Hand-drawn portolan (nautical) chart of the Lesser Sunda Islands, featuring a rhumbline network (the web of interconnected lines), shoals, reefs, elevations (side views of landmark mountains), and names of coastal settlements, all to aid navigation.

Colourful hand-drawn portolan (nautical) navigation chart, featuring bathymetry (sea depth), shoals and reefs, and anchor points. The coasts have pictorial representations of landmarks (trees, houses, mountains). Orientated with south at the top.

Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, elevations (side views of landmark mountains), and names of coastal settlements, all to aid navigation.

A brightly-coloured hand-drawn map of the Gulf of Siam, made for a ship’s captain. The elaborate compass roses are the centre of a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), islands, shoals and reefs are also marked.

Colourful hand-drawn portolan (nautical) navigation chart, featuring a rhumbline network (the web of interconnected lines), islands, shoals and reefs. With an elaborately decorated cartouche, scale and compass roses. Vellum on folding wood boards.

Colourful hand-drawn portolan (nautical) navigation chart, featuring a rhumbline network (the web of interconnected lines), islands, shoals and reefs. With elaborately decorated scales and compass roses. Mounted on folding wood boards.

A brightly-coloured hand-drawn map of the South China Sea. The compass is at the centre of a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), islands, anchor points, shoals and reefs are also marked.

This map focuses on maritime trade, with detailed coastal areas (and blank interiors), illustrations of sailing ships, a rhumbline network—a web of lines used to aid navigation—and an elaborate cartouche illustrated with traders and their wares.