Re: traditional navigators
I think what you are referring to is the practice of Bahamian navigation. This is a system where the locals use the water color to navigate with, dark blue, light blue, brown. They judge the waters by color and navigate around coral heads based on the color. There are none /few aids to navigation as we have in the US.
The Last Navigator, on Pacific Navigation the natives use stars, animal migration habits, birds, as natural navigational aids. Their is also a great deal of knowledge passed on, from generation to generation.
Where my boat is anchored, we know if the birds walking there, you dont want to go there.
Surprising how many people dont notice things like that.