Sailing across the ocean is not as easy as 'make sure you have supplies and your crew doesn't mutiny.' Yes, many of the real problems were solved by 1490 AD, b

Sailing across the ocean is not as easy as 'make sure you have supplies and your crew doesn't mutiny.' Yes, many of the real problems were solved by 1490 AD, but some were not. Longitude, for example, was insanely difficult. Many, many people have died at sea. Well-trained, prepared and determined people.