The remote Pacific was settled without a compass

Navigators in oceangoing canoes reached islands scattered across millions of square kilometres, steering by stars, swell, birds and clouds. The magnetic compass was not part of the kit.

Archaeology dates the settlement of Remote Oceania — the islands east of the Solomons, out to Hawaiʻi, Rapa Nui and Aotearoa — to the last two millennia, by people who had already crossed much of the western Pacific. The distances are not coastal hopping. A star path is a sequence of rising and setting stars whose bearing holds a course. Swell keeps a direction when clouds cover the stars, because a long ocean swell holds its line under local wind chop. Land birds in the morning, a cloud that sits over an island, the reflection of a lagoon on the underside of weather: these are the coastal instruments, used at the end. David Lewis documented living navigators across the region using them. Mau Piailug, from Satawal, later taught the same art to a Hawaiian crew and sailed it.

This is a specialist's skill, practised and fallible, not a mystic property of a people. Voyages failed. Canoes were lost. The settlement pattern is the evidence that enough of them worked, on purpose, in both directions: the settlement of the Pacific only makes sense if people could go out and, often, come back. A one-way accident does not fill an ocean with related languages. A navigation system does.