Just wondering really, i don't understand how you can navigate the ocean without GPS or SatNav, much less when you don't even have an accurate map of the world.
I've written about this a couple times before -- this is probably the most pertinent answer:
and I expanded that here:
u/b1uepenguin has also written quite a bit about navigation in Polynesia, which is quite interesting and relies on different techniques than those that grew out of the European milieu: