Suunto D4I User Manual page 48

2. Press [SELECT] to start/stop the stopwatch.
3. Press [DOWN] to take split times.
4. Keep [SELECT] pressed to reset the stopwatch.
After stopping the stopwatch, you can scroll through the split times
with [DOWN].
You can also use the stopwatch while diving for various timing
purposes. To activate the stopwatch in dive mode, keep [MODE]
pressed.
Start and stop the stopwatch by pressing [SELECT].
NOTE: If a deepstop activates while you are using the
stopwatch, the timer field is not visible.
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