The real work of the survey was then to commence south of the Río de la Plata, with return trips to Montevideo for supplies; details were given of priorities, including surveying Tierra del Fuego and approaches to harbours on the Falkland Islands. The west coast was then to be surveyed as far north as time and resources permitted. The commander would then determine his own route west: season permitting, he could survey the Galápagos Islands. Then, "Beagle" was to proceed to Point Venus, Tahiti, and on to Port Jackson, Australia, which were known points to verify the chronometers.