[PATCH] Support different salinity in planner

[Linus Torvalds]

On Nov 13, 2014 2:04 PM, "Anton Lundin" <glance at acc.umu.se> wrote:
>
> This came out of a discussion with a frend who had his Uwatec 330 show
> him a depth of 72 meters while his Liquivision Xen showed him 69 meters.
> This was due to that his Xen was set in salinity mode, while Uwatec 330
> always shows a depth calibrated against fresh water.

Wow. What an odd choice. But I checked the manual, and it's documented. I
guess the idea is that that way it at least shows a deeper depth than real,
so it's that conservative choice.

Anyway, I didn't mean to say the patch shouldn't be applied, it's more if a
"you seldom even know what the dive computer does, or the actual real
depth". It might be a good idea to warn about it, especially since planning
using fresh water gives you deeper dives, so while calibrating a dive
computer for fresh water is arguably conservative, *planning* for fresh
water is not. If your dive equipment shows saltwater depth, you're now
diving at higher pressures than you planned for if you follow the depth
profile..

    Linus
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