iwc PORTOFINO CHRONOGRAPH Mode D'emploi page 23

Reading the chronograph
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Chronograph seconds hand: The scale for the central
chronograph seconds hand runs around the edge of the
dial.
Minute counter: The 30-minute scale with a slow
jumping hand is situated on the subdial at 12 o'clock.
This hand makes two complete revolutions in one hour.
Hour counter: The 12-hour scale with short lines for the
1 / -hour display with a continuous hand is situated on the
2
subdial at 6 o'clock.
Using the chronograph
Start: To start the chronograph, press the start/stop
button.
Stop: To stop the chronograph, press the start/stop
button again.
Reset: Press the reset button. 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 button.