The "Euros were so smart and everybody else was dumb" does really fit into historical reality, Wajoma.
The Polynesians made voyages that Euros never accomplished until centuries later. Maybe if you read a history book rather than Ayn Rand you'd realize this.
That was never my angle you ijit. The history of navigation is a good one, take it or leave it, many people (I'm reluctant to say cultures, because it is a story of individuals from various cultures) contributed to it, there were people that devoted their whole life to it. You would learn about the tools developed and the knowledge required to use those tools. Absolute bare minimum tools, and in the absence of those tools you (or anyone) would be utterly lost. You're beginning to sound like D64.
Just so we know where you are. Do you think these fellows simply looked at the sky (when it happened to be clear) because when you're over the horizon there is nothing else, and they knew where they were and where they were going.
Even the most accurate compass devised could see you sail straight past land masses by 5 miles or 100 miles.
Edit: BTW that's not a book, that's a copy and paste wiki link, maybe you should try a book instead of the standard kaka notion action, google wiki, CTRL C, CTRL P
Edit 2: Haha I just checked your non-book wiki link, they sang their way there, haha. with a sextant made out of sticks and shells. My opinion of wiki just took another dive, but you should suck it up, maybe make a song about it.
Edit 8: It just gets better, they looked at the waves haha