Charts. Neiafu Harbor and approaches, Vavau Group, Tonga or Friendly Islands, south Pacific Ocean, from British survey in 1898, scale naut. m.=5.9 in.; Ofolanga Island and Anchorage, Haapai Group, Tonga or Friendly Islands, south Pacific Ocean, from British survey in 1898, scale naut. m.=6 in.; chart 1983.