Surveying of sandbanks around the harbour was completed on 18 March, and the ship made its way down the coast to survey the extent and depths of the Abrolhos reefs, completing and correcting Roussin's survey.
As medicións topográficas dos bancos de area arredor do porto estaban completas o 18 de marzo, e o barco navegou pola costa para medir a extensión e profundidade dos arrecifes de Abrolhos, completando e corrixindo as medicións de Roussin.