hi! fyi, there was a thread a few days ago which included some discussion on navigation in the Pacific - check it out
... and here are a few more related posts
Just how did the Polynesian people(s) manage to traverse the oceans so well?
How was Easter Island a remote place on Earth discovered by ancient people with rudimentary technology?
How did ancient seafaring peoples of Melanesia find remote islands like Easter Island, yet miss the Americas?
Polynesian diaspora
How did the original Native Hawaiians find Hawaii in the first place?