Free Dive Time Limit - Suunto D4 User Manual

6.3.2. Free dive time limit

The FREE mode has a time limit of 10 minutes. After 10 minutes, Suunto D4 will
automatically change from free dive to scuba bottom timer. After the dive, the no-fly
time will countdown from 48 hours. Also, you will not be able to dive in AIR or NITROX
modes until the no-fly time has counted down to zero. You can only set the Dive mode
to OFF.
NOTE
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If you want to dive in AIR or NITROX mode after diving in FREE
mode, remember to switch to the correct mode. Otherwise, the
free dive time limit will activate after 10 minutes.