IWC Schaffhausen Da Vinci 3761 Instrucciones De Manejo página 24

Using the chronograph
Start: To start the chronograph, press the start/stop button.
Flyback: You can start recording a new time immediately, even when the
chronograph is running. With the chronograph running, simply depress the
reset/flyback button fully as far as it will go. All three chronograph hands
are reset to zero, and a new measurement is started as soon as the button
is released.
Stop: To stop the running chronograph, press the start/stop button.
Reset: Depress the reset/flyback button fully as far as it will go. This will
reset all the chronograph hands to zero.
Aggregate time recording: You can add stop times together by pressing
the start/stop button again after the first measurement instead of the
reset/ flyback button.