How did early Sailors navigate the Oceans?

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Do you know how the early sailors navigate the oceans? The technology today makes it real easy to navigate the oceans. But it's very interesting to know how the early sailors managed to navigate without it. There's a lot of history on it. I tried my best to compile some important and interesting parts of it into this video. Hope you like it :)
Brightly Fancy Kevin MacLeod (incompetech.com)
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