More Uwatec Aladin TEC2G Log Data

[Thomas Gschwind]

Hi there,

I am using Subsurface and it reports all my salt water dives deeper than
they really are. So I downloaded the latest libdivecomputer sources and
looked at the code. The tec2g_header claims that the salinity setting of
this dive computer is not supported.

After looking at the dumps included in my SmartTRAK log where the dives are
correctly reported (SmartTRAK is nice enough to store the original dc
data), I am most certain to have located the salinity field in byte 62 of
the header.  Another indication is that it is also bit 0x10 as it is for
the others (see get water in uwatec_smart_parser_cache).

Just tried out setting the salinity field to 62 and works perfectly fine
for me.

Similarly, the timezone field most likely is 16. However, that one I cannot
test so well because the immersion time seems to be relative to the dive
computers system time which seems to be missing in the SmartTRAK logs. But
manually looking at the time zones, it matched for the first 50+ of my
dives.

I also figured out the max ppo2 configuration and partially the tissue
saturation before the dive --- if anybody is interested that data as well.
See http://tomsblog.gschwinds.net/2016/08/uwatec-smarttrak-and-aladin-tec2g/
for details.

Best,
Thomas
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