IWC Schaffhausen Portugieser Chronograph Rattrapante Mode D'emploi page 22

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U S I N G T H E C H R O N O G R A P H R A T T R A P A N T E
Start: To start the chronograph, press the start/stop push-button.
Intermediate timing: Actuate the split-seconds-hand push-but-
ton; this will stop the split-seconds hand, but it will not influence
time measurement. You have now recorded an intermediate time
while the standard stopwatch continues to run. By actuating the
split-seconds-hand push-button once again, you can cause the
split-seconds hand to catch up with the chronograph seconds
hand again, and your chronograph is then ready for the next inter-
mediate time stop.
Stop: To stop the chronograph, press the start/stop push-button
again. Both seconds hands stop simultaneously.
Reset: Press the reset push-button. This will reset all the chrono-
graph hands to zero. The separately stopped split-seconds hand
is not automatically reset, but must be reset by pressing the split-
seconds-hand push-button again.
P O R T U G I E S E R C H R O N O G R A P H R A T T R A P A N T E