[PATCH] Support different salinity in planner

[Paul Sargent]

On 15 Nov 2014, at 11:01, Henrik Brautaset Aronsen <subsurface at henrik.synth.no> wrote:

> Here's what Shearwater says:
> 
> «
> Fresh Water = 1000kg/m³
> EN13319 = 1020 kg/m³
> Salt Water = 1025 to 1035 kg/m³
> 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. 

This stuff would be so much easier if everyone used the same (correct) units for this stuff. Where’s my dive computer that has a display in kPa or bar? Then I could dive in custard and everything would still work, well… except the regulators.
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