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Fordan:While I love my Sensus Ultra, it's really more a dive recorder than a dive computer.
I broke down, and am using Oceanic's software on Windows XP via VMware Fusion.
Ditto.evil_xander:Uwatec has jTrak, free like SmartTrak for Windows, and it should work perfectly if you purchase the original Uwatec IrDa.
Otherwise, good luck with finding one IrDa adapter that works on OS X...