IWC Schaffhausen INGENIEUR CHRONOGRAPH SPORT Mode D'emploi page 29

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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 timing: You can add stop times together by pressing
the start/stop button again after the first measurement instead of
the reset/flyback button.
C A L C U L A T I N G S P E E D
When you complete a calibrated distance of 1 kilometre, you can
read your average speed directly on the tachymeter scale. Activate
the chronograph as you pass your starting point and stop it at
the end of the measured distance. You can now read the average
speed in kilometres per hour from the position of the chronograph
seconds hand on the tachymeter scale. Please note that any period
over one minute in length is invalid.
Example: It takes 40 seconds to drive 1 kilometre, so your average
speed is exactly 90 kilometres per hour.
I N G E N I E U R C H R O N O G R A P H S P O R T