The Padrón Real was constantly improved from its first version in 1507/08. It was produced by the Seville-based Spanish organization, the "Casa de Contratación", established in 1503. All returning ships had to report any details of new lands or discoveries they had made to the "Casa de Contratación", together with latitudes and longitudes. The ship's officers were put under oath before they testified. The pilots at the "Casa de Contratación" then plotted this information on their maps. When a new ship was setting out, they would then be given charts which were copied from the master map, the Padrón Real, which was later called the Padrón General.