31. He received instructions in hydrography and became an aspiring pilot in 1769 . He sailed to the Indian Ocean. 32. In 1797 he started working at the Hydrography Office in Madrid, of which he became director in 1815. 33. Sylvia returned to England late in August 1939 and found war work in London, initially for Naval Hydrography . 34. His important knowledge of the hydrography of the Black Mountain and Sor allowed him to imagine an ingenious irrigation system. 35. He was engaged in paleontology, stratigraphy, tectonics, paleoclimatology, applied geology, geological mapping, and hydrography . 36. Satellite geodetic data and methods can be applied to diverse fields such as navigation, hydrography , oceanography and geophysics. 37. He was nominated professor of hydrography at Marseilles in 1685, and in that capacity carried out various coast surveys. 38. The hydrography of Azerbaijan basically belongs to the Caspian Sea drainage basin to which all rivers in Azerbaijan flow to. 39. He also wrote a " Treatise on Hydrography " that became the study text for the naval academy. 40. There are also schools for naval specialisations such as marine engineering, Officer of the Watch, hydrography and communications.
