High altitude / Bergseemodus?

[scubatinoo]

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...

[Bardass]

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

[scubatinoo]

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...

[Bardass]

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

[scubatinoo]

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...

[Bardass]

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

[scubatinoo]

ok, i see the dilemma

[JeanDo]

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,