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Based on surveys by Sir Stamford Raffles, this German map of Sumatra focuses on the navigation of coasts and straits, with bathymetry (sea depth), anchor points, shoals and reefs marked, including on inset maps of Singapore and the Bangka Strait.

This map of the Straits of Malacca features shoals and reefs, bathymetry (sea depth), drawings of side views of landmark mountains (elevations) and written observations, all designed to aid navigation. Pencil marks indicate the map was actually used.

This map of the Straits of Malacca features shoals and reefs, bathymetry (sea depth), drawings of side views of landmark mountains (elevations) and written observations, all designed to aid navigation.