Right Crown (as shown in this view)
- In position - to wind the alarm
- Out position - to set the alarm and to turn off the alarm

Middle Crown
- To set the dive time reminder on the perimeter bezel (doesn't pull out)

Left Crown
- In position - to manually wind the movement
- Out position - to set the time (also to advance the calendar by cycling
back and forth between 10:00 and 2:00 - ratchets 1 day per cycle)