Martín Cortés de Albacar

Martín Cortés de Albacar (1510–1582) was a Spanish cosmographer. In 1551 he published the standard navigational textbook Arte de navegar. A decade later (1561), Arte de navegar became the earliest known English navigation manual up to date with all of the strategies used at the time. He was an early proponent of a hypothetical celestial magnetic pole.