Quoted: A study guide titled “Robert Hooke, Hooke’s Law & the Watch Spring”, written by Shusaku Horibe from the University of Wisconsin-Madison in the US, explains that “the determination of longitude was a major problem by the mid-seventeenth century … One needed a clock able to keep accurate time on long voyages at sea … The development of portable and jerk-resistant watches that could be taken on ships and could keep accurate time for extended periods was an obvious economic concern.”
Office of Strategic Communication