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How does the OSTC react in higher altitudes? Are there any ranges like 0-700m, 700-1500m and 1500 and higher or will the calculating be done by actual pressure? It's just because i red in the manual, that the sensor (Barometer) "is not very exact"...

Wie funktioniert der OSTC in grösserer Höhe (Bergsee)? Sind auch Bereiche definiert wie 0-700m, 700-1500m und 1500 und höher oder wird die Sättigungs/Deko-Berechnung aufgrund des aktuell gemessenen Luftdrucks gemacht? Habe nur grad im Manual gelesen, dass der verbaute Sensor (Barometer) nicht sehr exakt sein soll...

Where do you read that in the manual ?
OSTC use ambient pressure for calculations, Cf Bühlmann decompression algorithm

German Manual, Page 32 --> "Altimeter"

If i'm standing at a lake 2000 meters above sealevel, how can i check that my OSTC uses "the right altitude"?

Ambient pressure in 2000m can change by weatherconditions...

you're wrong
OSTC calculate an estimate altitude (in meters or feets) depending on weather conditions : altitude varies because the pressure varies.
the warning is related to the exact calculation of the altitude, not pressure.
If you want a correct altitude, don't use OSTC or recalibrated it with a moutain map.

OSTC don't need to get the correct altitude to calculate decompression. Altitude is just an information.
even if the pressure was slightly wrong, it would not matter : decompression is calculated from PRESSURE GRADIENTS between surface and depths

So i missunderstood the altimeter function... but if the altimeter is not used for anything, why is it interesting? there are less expensive digital altimeters available...

the calculation and display of the altitude were asked by some divers only as an information
they were provided by HW in version 1.8, if i remember


http://www.heinrichsweikamp.com/read.ph ... 7#msg-3987
see JeanDo

ok, i see the dilemma

By the way, I did the Altimeter, and are at the origin of the "not very precise" comment. It means +/- 40m (once you calibrated it from the meteo). This is the noise of the pressure sensor.

Obviously, it have no measurable incidence on the decompression results.

Regards,