[PATCH] Support different salinity in planner

[Paul Sargent]

On 18 Nov 2014, at 15:46, Paul Sargent <paul.lionseye at icloud.com> wrote:

>> The EN13319 (European CE standard for dive computers) value is between fresh and salt and is the Predator default value. The EN13319 value corresponds to a 10m increase in depth for pressure increase of 1 bar.
> 
> Sorry to resurrect, but that last statement is patently wrong. It would be 1.02 bar, which is pretty close to an atmosphere (1.01325 bar) but still not 1-to-1. 

No, I was wrong. Ignore me. Gravity gets in there with it’s nearly 10, but not quite stuff. 1.020 kg/m³ does indeed work out to ~1 bar

I’ll shut up now.
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