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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.

A hand-drawn map designed to aid navigation around the southern coast of Luzon and the islands of the central Philippines. It features side views of coastal hills and mountains (‘elevations’) to use as landmarks, as well as towns, shoals and reefs.