Before revision: online Esmeraldo de Situ Orbis (c. 1509, by Duarte Pacheco Pereira, Portuguese)Esmeraldo de Situ Orbis, 1892 edition, Lisbon: Imprensa Nacional.online
After revision: Arabic nautical corpus (late 15th–early 16th century) including the works of Aḥmad ibn Mājid and Sulaymān al-Mahrī, on all technical aspects of stellar navigation throughout the Indian Ocean.online Esmeraldo de Situ Orbis (c. 1509, by Duarte Pacheco Pereira, Portuguese)Esmeraldo de Situ Orbis, 1892 edition, Lisbon: Imprensa Nacional.online