IWC Schaffhausen PILOT'S WATCH CHRONOGRAPH Mode D'emploi page 25

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USING THE CHRONOGR APH
Start: To start the chronograph, press the start/stop push-button.
Stop: To stop the chronograph, press the start/stop push-button again.
Reset: Press the reset push-button. This will reset all the chronograph hands to zero.
Aggregate timing: You can add recorded times together by pressing the start/stop push-button again
after the first measurement instead of the reset push-button.
PILOT'S WATCH CHRONOGR APH