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A Spanish military map of the northern Philippine island of Luzon, highlighting cable and telegraph lines, and aids to maritime navigation such as bathymetry (sea depth) and tide data. A conversion table for metres, fathoms and feet is also shown.

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.

Southeast Asia is shown on sheets two and three of this 12-sheet map of the Indian and Pacific oceans, including detailed inset maps of the straits of Singapore, Bangka, Gaspar and Sunda, with bathymetry (sea depth), shoals, reefs, anchorages etc.