Because Polynesia was settled from west to east against the prevailing trade winds, the islands could not have been reached by canoes blown accidentally off course; sailing into the wind lets voyagers turn back safely if no land is found, making systematic exploration survivable. The direction of settlement is therefore itself evidence of intentional, skilled voyaging rather than drift.
Traditional Pacific navigators held position using memorized star paths, swell patterns, cloud formations, and bird behavior rather than charts or compasses, carrying the course as an internal mental model updated continuously. The method is non-transferable to paper: it lives in trained perception and is lost when the practice stops being used.
In 1976 a reconstructed double-hulled canoe, Hokule'a, sailed from Hawaii to Tahiti navigated solely by Micronesian wayfinder Mau Piailug using stars, swells, and birds, with no instruments. Its arrival demonstrated that non-instrument navigation over thousands of miles of open ocean was physically possible, converting a contested theory into a reproduced fact.
The settlement story becomes credible not from any single source but from the alignment of archaeology (pottery, radiocarbon dates), linguistics (language family branching), genetics (population descent), and oral tradition pointing to the same west-to-east pattern. When methods with unrelated error sources agree, the shared conclusion is harder to dismiss than any one line alone.