NUKU'ALOFA, TONGA — When visitors fly into Tonga's azure waters for whale watching in Vava'u, island-hopping across Ha'apai or diving the reefs of 'Eua, they rely on aviation systems that depend on accurate, certified weather information. Now, the Tonga Meteorological Service (TMS) is investing in the people and systems that keep those services and the economy running safely.