HMS Grenville, was a schooner (later re-rigged as a brig) built in Marblehead, Massachusetts,[2] and originally named Sally.

[6] For each summer season of Cook's command, Grenville sailed from Deptford to Newfoundland and Labrador to survey the coastal waters.

In 1766, Cook was able to make an exact fix of longitude from observations of a solar eclipse.

At the end of the 1767 surveying season, Grenville ran aground near the Nore lighthouse in a severe storm (shortly after taking on board a pilot for the Thames estuary).

[7] In 1768, Cook left Grenville to begin his first circumnavigation of the world on HMS Endeavour.