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A navigation map of the northern tip of Sumatra, featuring bathymetry (sea depth), reefs, shoals, and side views of landmark mountains (elevations). Lighthouses are highlighted in red and yellow, with lines to indicate the limits of their range.

Navigation map of the mouth of the Padang Tikar River, on the west coast of Borneo, featuring bathymetric (water depth) routes. Obstructions are marked with letters: ‘m’ (mud), ‘z’ (sand). Trees, hills and fishermen’s houses are shown as landmarks.

Navigation map of the mouth of the Padang Tikar River, on the west coast of Borneo, featuring bathymetric (water depth) routes. Obstructions are marked with letters: ‘m’ (mud), ‘z’ (sand). Trees, hills and fishermen’s houses are shown as landmarks.