Porsche Boxster Owner's Manual page 144

Stopping the timing
After time measurement is started, the on-board
computer display changes to the "Stop timing/In-
termediate time".
f Select "Stop timing" with the operating lever.
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Instruments, On-Board Computer, Warnings
f Push lever forward.
The time is stopped in all stopwatch displays,
and the on-board computer display changes to
the "Continue/Reset" selection.
The timing can be continued or reset to zero.
Continue timing
After timing has been stopped, the on-board com-
puter display changes to the "Continue/Reset" se-
lection.