Not to answer the question , but to pose one . Many years ago I read an article that stated that Columbus spent several years with his youngest son at a mission where the son was studying for priesthood . At this mission were stored the journals of Brendan , the Irish monk who was reported to have sailed across the Atlantic and up to the the north-east corner of No. America and back to Ireland , in a leather boat . The author believed that was were Columbus learned of the trade winds , when Columbus departed Spain he sailed South for several days to the Canaries before turning west just as Brendan had done 400 or so years before . I have since lost this material , has any person on here heard of this ?
Trying not to answer directly to the OP, even if my answer wouldn’t be complete, but mainly answering to you.
The “Navigatio Sancti Brendani” was widely known in the late Middle Ages, widely copied in monasteries and widely known if not read by those who navigated in the Atlantic ocean. So we can assume that quite naturally Columbus knew the story (if my memory doesn’t betray me, and sometimes it does, he even mentions it in one of the side notes he wrote in a book).
I think that it was in 1973 that Paul H. Chapman launched that “thesis” that Columbus learned to said from Saint Bredan’s book. But as any hagiography the details, and specifically the sailing details, are not abundant:
https://www.amazon.com/man-who-led-Columbus-America/dp/0914032011
Portuguese, Galician, Basque and Breton fishermen were fishing cod fish at least since the end of the 14th century in the North Atlantic.
The Azores Islands, in the Middle of the Atlantic, often identified in Portolan charts has “The Islands of Saint Brendan”, were (re)discovered and colonized by the Portuguese since the beginning of the 15th century.
The Madeira Islands were also (re)discovered and colonized since the beginning of the 15th century by the Portuguese, and expeditions to the Canary Islands were made since at least the 14th century, by Portuguese, Genoese, Majorcans…
Columbus had strong relations with Genoa, worked for Genoese, and it is probable that he was born there. Columbus lived in Portugal between 1476/7 and 1485, sailed in Portuguese ships trough the Atlantic (to Mina, to Madeira, and in Portuguese or Genoese ships to the British Islands and eventually to Iceland) and married with a Portuguese noblewoman, daughter of the first Capitan of the Island of Porto Santo (Madeira Islands).
So, why a seasoned sailor, that sailed with the Portuguese (and with others) extensively in the Atlantic, would learn winds from a hagiography? Saint Bredan myth was just one more story to confirm that there were lands to the West.