On 12-09-14 08:55, Willem Ferguson wrote:
I really struggle with this dive computer. It is a Zen IQ900 DC of a
colleague who is heavily involved in NAUI Scuba Diver training (i.e.
"open water"). So most of his dives are in the 3m to 15m range. He wants
to see more detail of gas loading because of the yo-yo diving inherent
in introductory training. Subsurface does an upload of data, but the
data are weird.
Firstly, The DC should have 99 dives, the maximum number stored by the
Zen. On Subsurface it only shows 10 dives.
Linus' explanation is correct. The number of logbook entries (with just a
summary of the dives) is much larger the available memory for storing the
profiles. If you want to store more profiles, you need to increase the sample
interval (for example 30 seconds instead of 10s).
Secondly Subsurface sees some very funny values being read, as is
obvious from the xml dive log. For instance, on the last dive, it sees
cylinder pressures as well as a gas mixture that should not come from
the DC as it is a) not air-integrated and b) nitrox was disabled for
that dive. The temperature values are crazy. The depth profiles profile
look about right.
This is most likely a bug in the libdivecomputer parser. Unfortunately these
kinds of parser bugs happen all the time for oceanic devices, because they use a
slightly different data format for each device. To fix this, we just need to
find the difference and add yet another device specific change in the atom2 parser.
Thirdly the depth scaling that Subsurface does for the dives is crazy
for all except the first and last dives.
I'll leave this question for someone else...
Jef
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