🔍 Key Concepts

• How often spring-driven marine chronometers must be wound to maintain accurate timekeeping • The importance of consistent daily routine in traditional celestial navigation practice • What happens to time accuracy as the mainspring runs down over time

💭 Think About

• Think about the navigator’s daily routine: how frequently would it be practical and standard to service a chronometer on an ocean voyage? • Consider why navigators prefer a fixed time of day for winding—how does that help track and minimize error? • Ask yourself: would a professional navigator risk letting a precision timepiece run several days without attention?

✅ Before You Answer

• Verify the typical daily procedures for maintaining navigational instruments on long voyages • Consider the relationship between chronometer power reserve and its most accurate portion of the mainspring run • Make sure the interval you choose would support high‑precision longitude determination using celestial navigation