IWC Schaffhausen PORTUGIESER TOURBILLON RÉTROGRADE CHRONOGRAPH Mode D'emploi page 24

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U S I N G T H E C H R O N O G R A P H
Start: To start the chronograph, press the start/stop push-button.
Flyback: You can start recording a new time immediately, even
when the chronograph is running. Simply depress the reset/fly-
back push-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 push-button is released.
Stop: To stop the running chronograph, press the start/stop
push-button.
Reset: Depress the reset/flyback push-button fully, as far as it
will go. This will reset all the chronograph hands to zero.
Aggregate timing: You can add stop times together by press-
ing the start/stop push-button again after the first measurement
instead of the reset/flyback push-button.
P O R T U G I E S E R T O U R B I L L O N R É T R O G R A D E C H R O N O G R A P H