SUUNTO D3 - Manual (Page 18)

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computer watch gives a beep and returns to the time keeping display automati-
cally.
Use the + and - buttons to operate the elapsed time measurement, split time
measurement or the times of two runners as follows:
Diving with the D3 or performing data transfer will stop the stopwatch. However,
it is possible to use stopwatch function when diving, if both the GAUGE and the
FREE diving modes are disabled (set to OFF, see chapter 4.4.). In dive mode the
stopwatch cannot be operated.