Hydrographic charts produced by Australia covering the waters of Australia, Papua New Guinea, East Timor, Solomon Islands and Antarctica. Relief shown by contours and spot heights. Depths shown by bathymetric tints, soundings and isolines. Series includes ocean, coastal and harbour charts showing depths, nature of the sea floor, hazards, aids to navigation, tides and currents. Some charts show topographic details of adjoining coasts. Earlier charts show depths in fathoms, and later in metres.