What is it about?
This study looks at two 1580 maps of Mexico's Gulf Coast by navigator Francisco Gali. Unlike most sketches, these were nautical charts. Comparing them with modern data reveals how accurately he mapped coastlines with 16th-century instruments.
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Why is it important?
Most 16th-century colonial maps prioritized symbolic representation over measurement. Gali's charts are exceptional because they apply rigorous nautical methods to map New Spain, achieving remarkable coastal accuracy. This research highlights the advanced skills of Spanish navigators and provides a new comparative methodology for studying early colonial cartography. It also reveals how the search for an interoceanic passage drove precision mapping in unexpected corners of the Spanish Empire.
Perspectives
Handling these 440-year-old manuscripts in the archives of Madrid and Austin is always a humbling experience. What fascinates me most is that Francisco Gali achieved coastal measurement errors as low as 1.3% with nothing more than an astrolabe and a compass. These maps remind us that behind every historical document lies a human story of skill, ambition, and observation. For me, Gali's work is a testament to the scientific sophistication that existed in early colonial navigation, often overlooked in favor of more famous explorers.
Dr Manuel Morato-Moreno
Universidad de Sevilla
Read the Original
This page is a summary of: Análisis cartográfico de los mapas de Francisco Gali para las Relaciones Geográficas del siglo XVI: Tlacotalpan y Coatzacoalcos (1580), Boletín de la Asociación de Geógrafos Españoles, July 2026, Buletin Asociacion Geografos Espanoles,
DOI: 10.21138/bage.3789.
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