In addition to the expedition's work with the Nootkas, astronomical observations are made to fix the location of Nootka Sound and calibrate the expedition's chronometers.

Nootka Sound is surveyed and mapped with an accuracy far greater than had previously been available.

Unexplored channels are investigated.

The maps are also linked to the baseline established by Captain Cook, allowing calibration between Spanish and British charts.

Botanical studies are carried out, including an attempt to make a type of beer out of conifer needles that is hoped to have anti-scorbutic properties for combating scurvy.

The expedition ships take on water and wood, and provide the Spanish outpost with many useful goods, including medicines, food, various tools and utensils, and a Réaumur scale thermometer.