Wrong profiles importing from Diving log 5.0 to Subsurface 4.1

Davide DB dbdavide at gmail.com
Tue Jul 22 10:52:36 PDT 2014

Thanks for explaining what's happening under the rimes. I was not aware of
such adjustments.

Actually my request to Diving Logs is to have the same behavior trough

My test dive was logged as 103m into Aladin Tec2G and SmartTrack.
It still was 103m once imported into Diving Log.
One I exported in UDCF format it became 105.5
Exported in UDDF it was 103 but it removed the dive spot names.
In xml those small misalignment provoked a bug on our side.

On the other hand I understand that Diving Log has so many import/export
options that it's difficult being always consistent.

The road of the digital diver it's a difficult one :)

2014-07-22 19:16 GMT+02:00 Linus Torvalds <torvalds at linux-foundation.org>:

> On Tue, Jul 22, 2014 at 9:08 AM, Davide DB <dbdavide at gmail.com> wrote:
> > Good catch indeed!
> > So UDDF has the same problem with depths.
> It may not be a "problem".
> Many (most?) dive computers have the notion of a per-dive maximum
> depth totally *separately* from the actual sample depths. The maximum
> depth may be measured at a finer interval than the samples, for
> example, and/or might be done without any smoothing of the instant
> data etc.
> Normally such a max depth should be at least as deep as the sample
> depths, but who knows.
> Anyway, the dive logging software may or may not support a separate
> max depth, and may or may not correct that max depth depending on
> samples. For example, in subsurface, we *do* take the max depth from
> the dive computer, but then we also end up saying "hey, if any samples
> have a deeper depth, we'll correct the max depth" (see
> fixup_dive_dc()).
> So it's entirely possible that the maximum depth is off from the
> maximum sample depth by a few feet. Looking at your divinglog
> question, it sounds like divinglog doesn't do the "max depth fixup"
> that we do. But not doing the fixup isn't exactly wrong, it's just a
> "what is the meaning of max depth? Do you want to save what the
> computer reported even if it doesn't make a whole lot of sense or
> not?"
>             Linus

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