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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.