A Spanish expedition led by captain Estêvão Gomes, a Portuguese sailing for Emperor Charles V, arrived in New York Harbor in January 1525 aboard the purpose-built caravel "La Anunciada" and charted the mouth of the Hudson River, which he named Rio de San Antonio. Heavy ice kept him from further exploration, and he returned to Spain in August. The first scientific map to show the North American East coast continuously, the 1527 world map known as the Padrón Real, was informed by Gomes' expedition, and labeled the Northeast as Tierra de Esteban Gómez in his honor.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What was the first map to show the whole North American East coast?
Padrón Real