Another Island To Explore, also known as AITE.
Finishing up our map filling in the south, we finally reconvene with the original plan, and meet up at Dragon Roost Island. From there, we sail north and then east. Pretty much rinse and repeat: fill out the map, ramble some more and slowly inch our way toward the Forsaken Fortress.
Oh yeah, BTW, those bird enemies are actually called Kargarocs. Yeah, I dunno why I didn't catch that, but my bad for leaving that mistake unchecked.