Suunto t1 User Manual page 22

While the stopwatch is running, you can take up to 99 lap times, the first 30 of which are stored
in the memory, by short pressing the UP button.
When the stopwatch has been stopped, you can either view the Summary of the most recent
session or reset the stopwatch, as shown in the figure below. Resetting the stopwatch does not
reset the Summary.
If your heart rate in the most recent session exceeded the maximum heart rate defined in Personal
settings, Suunto t1 will ask if you want to update your maximum heart rate value after resetting
the stopwatch.
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Pressing the UP button, when
the stopwatch is running, stores
the split time and displays it in
the top row of the Suunto t1. It
also displays the average heart
rate and shows the lap time.
After 3 seconds the display
jumps back to the stopwatch.
Pressing the UP
button when the
stopwatch is
stopped takes you
to the Summary
display.
This number
indicates the
ongoing lap.
Long pressing the UP
button when the stopwatch
is stopped resets the
stopwatch. Resetting the
stopwatch doesn't reset the
summary.