The Island of Diego Garcia is in the Chagos Group some 1,600 kilometres south of the tip of India. It is one of only five monitoring stations in the world for the Global Positioning System positioning system. It is still unclear after whom the island was named though the group first appears on the Pierre Descelier manuscript of 1550. The highly important Edward Wright printed world map of 1599 is the first to record Diego Garcia under its present name. From 1781 supplement to 'Neptune Oriental'. The material collected for 'Le Neptune Oriental' was approved by the French Compagnie des Indes. D'Apres de Mannevillette was one of the first Hydrographers of France and an accomplished navigator. Born in Le Havre to a captain in the French West India Company he made a voyage to the Caribbean in 1726. He show an early interest in Navigation and was one of the first Frenchmen to use Hadley's quadrant and was later in life a friend of Dalrymple. Upon the atlas' publication it was highly commended by everyone. NMM 203.