![Fuerte Real y su bahía situado en la Ysla Martinica en la pate [sic] del oeste de la dha. en la latitu. de 14⁰ y 36⁰⁰ norte y en 376⁰ y 14⁰⁰, meridiano de Tenerife.](https://cache.getarchive.net/Prod/thumb/cdn18/L3Bob3RvLzIwMTkvMTAvMDgvZnVlcnRlLXJlYWwteS1zdS1iYWhpYS1zaXR1YWRvLWVuLWxhLXlzbGEtbWFydGluaWNhLWVuLWxhLXBhdGUtc2ljLWRlbC1vZXN0ZS1iYzIwYjctMTAyNC5qcGc%3D/320/416/jpg "Fuerte Real y su bahía situado en la Ysla Martinica en la pate [sic] del oeste de la dha. en la latitu. de 14⁰ y 36⁰⁰ norte y en 376⁰ y 14⁰⁰, meridiano de Tenerife.")
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![Plano de las Yslas Malvinas, situado en latitud S. 51⁰ 28⁰⁰ [?] y en 319⁰ 30ʺ [?] lamas leste segun el meridiano de Tenerife, arreglado a los ultimos reconocimientos edios en ellas por mar y tierra, de orden de su Gobernador D. Felipe Ruiz Puente.](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE3OTIvMDEvMDEvcGxhbm8tZGUtbGFzLXlzbGFzLW1hbHZpbmFzLXNpdHVhZG8tZW4tbGF0aXR1ZC1zLTUxLTI4LXktZW4tMzE5LTMwLWxhbWFzLWxlc3RlLTY0MC5qcGc%3D/40/28/webp "Plano de las Yslas Malvinas, situado en latitud S. 51⁰ 28⁰⁰ [?] y en 319⁰ 30ʺ [?] lamas leste segun el meridiano de Tenerife, arreglado a los ultimos reconocimientos edios en ellas por mar y tierra, de orden de su Gobernador D. Felipe Ruiz Puente.")
Fuerte Real y su bahía situado en la Ysla Martinica en la pate [sic] del oeste de la dha. en la latitu. de 14⁰ y 36⁰⁰ norte y en 376⁰ y 14⁰⁰, meridiano de Tenerife.
Summary
Shows Fort-de-France Bay including the fort.
Depths shown by soundings.
Prime meridian: Tenerife.
Oriented with north to the left.
Watermark: Strasburg fleur-de-lis.
Pen-and-ink and watercolor.
Mounted on cloth backing.
LC Luso-Hispanic World, 518
Available also through the Library of Congress Web site as a raster image.
Maggs number annotated in pencil in lower right corner: 222.
Vault
In the 17th century, maps took a huge leap forward. Mathematical and astronomical knowledge necessary to make accurate measurements had evolved. English mathematicians had perfected triangulation: navigation and surveying by right-angled triangles. Triangulation allowed navigators to set accurate courses and produced accurate land surveys. Seamen learned to correct their compasses for declination and had determined the existence of annual compass variation. Latitude determination was greatly improved with the John Davis quadrant. The measurement of distance sailed at sea was improved by another English invention, the common log. Longitudinal distance between Europe and Québec was determined by solar and lunar eclipses by the Jesuit Bressani in the 1640s and by Jean Deshayes in 1686. With accurate surveys in Europe, the grid of the modern map began to take shape.
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