TV drama entitled "Black Sails"

I began to watch the American TV drama entitled "Black Sails". It's a pirate's story and there are we can see a bright blue sea, sailing ships and battles on the sea in the drama. I like pirate's dramas or movies and I am interested in the Age of Discovery. There weren't aren't high technology such as GPS, radar, engines at the time. If we make a voyage without such equipment, we will fear the big ocean and a windstorm so much. I think that I feel the dream because there wasn't aren't such technology.