"4 March 1779. The British ships are again at Kaua'i, their last days in the islands, some thirteen months since their initial visit. A number of Hawaiian men come on board and under the direction of their women, who remain alongside in the canoes, the men deposit navel cords of newborn children in cracks of the ships' decks (Beaglehole 1967:1225).⁸⁾ 

⁸⁾ For an analogous behavior observed by the missionary Fison on the Polynesian island of Rotuma, see Frazer (1911, 1:184). Hawaiians are connected to ancestors (auumakua), as well as to living kinsmen and descendants, by several cords emanating from various parts of the body but alike called piko, 'umbilical cord'. In this connection, Mrs. Pukui discusses the incident at Kaua'i: 

I have seen many old people with small containers for the umbilical cords... One grandmother took the cords of her four grandchildren and dropped them into Alenuihaha channel. 'I want my granddaughters to travel across the sea!' she told me. 

Mrs. Pukui believes that the story of women hiding their babies' pikos in Captain Cook's ship is probably true. 

Cook was first thought to be the god Lono, and his ship his 'floating island'. What woman wouldn't want her baby's piko there?" (Pukui et al. 1972, 1:184)"

(Islands of History)