Hi Dmaziuk,
You are correct that freshwater has a density of 1000 kg/m^3 at 4°C. However, this is the peak density of freshwater. At higher or lower temperatures the density is less. For example, at 20°C the density is about 998 kg/m^3.
Yes, but that is density/temperature. I was referring to salinity, as in: the bodies of water many/most of us dive into would usually have more dissolved stuff than the well-calibrated reference fresh water.
I am not aware if all other manufacturers use pressure directly in the decompression calculations, or if some use the converted depth.
That would be a silly thing to do, programming-wise, but I've seen enough requirements specifications that it wouldn't surprise me.
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