Polynesian wayfinding is the art of holding a course across open ocean with no instruments at all, and the revival of the practice has put its outline into the open record, where this atlas can describe it. The frame of the system is a star compass: the navigator learns the horizon as a circle of named houses, and knows which stars rise and set in which house at each season. A star is only useful near the horizon, so the navigator works with a sequence of them through the night, each rising star replacing the last, with bright anchors such as Hokupa'a, the fixed star of the northern sky, and the southern guides toward Atutahi and the Southern Cross.
Stars are the clearest signal but not the only one. When cloud closes the sky the navigator reads the ocean itself, holding direction by the feel of long swells generated by distant winds, and near land reads shorter signs: the birds that fly out from shore in the morning and home at evening, the standing clouds that gather over islands, the change in the colour and pattern of the water. Distance is kept by dead reckoning, the navigator holding the whole voyage in memory, awake for most of it. None of this page teaches navigation, and it could not; the knowledge lives in years of instruction at sea. What it records is what the tradition is, and that it is alive.