What does the Flyback function mean?
A “Flyback” or “Retour a vol” is a function which allows the chronograph to be reset to zero without having to stop the chronograph first (remember that a normal chrono requires you to stop the timing before resetting). This is useful for aviation, where several segments or legs of a route are flown for specific periods of time in sequence; the act of stopping, resetting, and restarting leads to a short delay at the beginning of timing the next leg. This delay, reportedly, can be an important factor in some precision military operations, for example.
