Commission for the Geological Map of the World. Institut français pour la recherche et la technologie polaires. Commission de la carte géologique du monde. North Decimal Degree 30.00000. South Decimal Degree -71.2500. East Decimal Degree 155.0000. West Decimal Degree 0.0000. Alternate title:Map of the Indian Ocean = Carte de l'océan Indien. Mercator projection. Relief shown by gradient tints. Depths shown by gradient tints and isolines. Ancillary map showing tectonic plates location. Accompanied by sheet 1: Map of the Indian Ocean: physiography (sheet 1) = Carte de l'ocean Indien: physiographie (feuille 1).