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Produced by the British Admiralty’s Hydrographic Office, this map includes various navigational aids, such as maritime routes, bathymetry (sea depth), tide and current data, and elevations (side views of hills and mountains to use as landmarks).

To aid navigation, this map shows small islands, shoals and reefs, maritime routes for use during monsoons or at particular times of the year, bathymetry (sea depth), tide information, shipwrecks, compass roses and landmark mountains at the coasts.

This navigation map of the mouth of the Kaladan River on the west coast of Arracan (modern Myanmar) features drawings of coastal features (elevations), bathymetry (sea depth), shoals and reefs, landmarks, and notes on how to enter the river safely.

Navigation chart of part of the South China Sea leading to the eastern entrance of the Singapore Strait. Features bathymetry (sea depth), anchor points, shoals and other obstructions, landmark hills, and detailed explanatory notes.

Navigation chart of part of the South China Sea leading to the eastern entrance of the Singapore Strait. Features bathymetry (sea depth), anchor points, shoals and other obstructions, landmark hills, and detailed explanatory notes.

Map focusing on the passage between Penang Island and the mainland, with shoals and reefs marked and described, and bathymetry (sea depth) shown. There are anchor points at George Town harbour, and landmarks—hills, trees, a fort—to aid navigation.

Map focusing on the passage between Penang Island and the mainland, with shoals and reefs marked and described, and bathymetry (sea depth) shown. There are anchor points at George Town harbour, and landmarks—hills, trees, a fort—to aid navigation.