SUUNTO Core - Manual (Page 36)

2. Start, stop and restart it with [Start Stop]. Begin a snorkeling dive.
3. When you return to the surface, reset by holding [+] pressed.
CAUTION: Do not push buttons while the device is under water.
NOTE: You need to reset your log recorder in the ALTIMETER profile before using
the log recorder in the DEPTH METER profile. Otherwise, your maximum depth will
stay the same as your current altitude above the surface.
TIP: When you have stopped your log recorder, before resetting it, you can
enter the logbook and view your current recordings!
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