Managing precision: how to use chronometers accurately at sea

Marine chronometers, often considered precision instruments, proliferated in navigational practices during the nineteenth century. This paper examines their use in the hands of naval officers in the early-nineteenth century. It argues that both the instruments and their operators required careful management and regulation. In addition, officers learnt and adapted observatory practices relating to the process of data collection and management. Through these means, chronometric data was collected, organized, and reduced to negotiate accurate results.