<<<< Scuba Instructor
50m = rain oks but dry it when you can
100m = shower bath swiming pool (dont sit on the bottom to long )
200m = Dive watch
as far as the new way of markin in ata 1 ATA = 1bar pressure = 10m of seawater
we are at 1 ata 1 bar at the surface ( ata is one atmosphere and we are at the bottom of the atmosphere of air stretching up above us 10 m of sea water has the same pressure as the whole 60miles of air) so 10 m in seawater = 2 Bar / ata
so a 5 ata watch is only 40m
so you need a 21ata rating for the full 200m
ATB
Duncan
oh and if the bezel turns both ways its usless for Diving it should only turn one way and ratchet round so it wont move with out a deliberate turn once set
not htat we use they bezel as a dive time marker any more but its a handy back up