By commission of the Board of Longitude, Kendall completed in 1774 at a cost of £100, a third chronometer known as the K3, effectively a refined and simplified version of his earlier inventions.

The K3 was the first successful attempt to produce, without such embellishments and refinements as those of the K1 and the K2, an equally accurate chronometer at a more affordable price; the idea being to spread within a larger number of users the benefit of this new technology of navigation. Mastering this new method of finding the Longitude was a major contributing factor in the domination of the world by the British Navy.

The K3 was used by the famous explorer George Vancouver on board of the HMS Discovery. He was an English officer and explorer who charted North America’s north western Pacific Coast between 1791 and 1795 and also explored the Hawaiian Islands and the southwest coast of Australia. Vancouver found that the K3 performed extremely well  and enabled him to navigate under very difficult weather conditions.

The city of Vancouver in Canada along with Vancouver island were so named because of the voyage of Capt. George Vancouver with his Larcum Kendall watch.