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Three maps of the Caroline Islands. One shows colonised areas in Southeast Asia: Dutch East Indies; British North Borneo, British New Guinea; German New Guinea; Philippines (Spain); Portuguese Timor. The route of the Challenger expedition is marked.

Designed to aid navigation around the western Java Sea, this map features bathymetry (sea depth), current and tide data, and is marked with shoals, reefs and other hazards. Written notes add details at specific locations (e.g. ‘heavy tide rips’).

Navigation map of the Celebes Sea, Makassar Strait and Java Sea, with bathymetry (sea depth), maritime routes, shoals and reefs, and landmark coastal mountains to aid navigation. On two sheets, which may not be from the same original map.

Chart of the north coast of Java, featuring a rhumbline network—a web of lines to help plot routes—bathymetry (sea depth), shoals, reefs and side views of landmark mountains (elevations), all to aid navigation. With an inset map of nearby islands.

Chart of the north coast of Java, featuring a rhumbline network—a web of lines to help plot routes—bathymetry (sea depth), shoals, reefs and side views of landmark mountains (elevations), all to aid navigation. With an inset map of nearby islands.