Surface pressure compensation

[Berthold]

I got a new OSTC+ with FW 10.75. My surface pressure reading is consistently about 33hPa too high (i.e. 1069 instead of the correct 1036hPa). I tried to adjust via compensation values through OSTConfig but whenever I enter negative values, the compensation value in the Information page shows -99hPa, and the actual indicated pressure value remains unchanged.

Is there any solution to this, and does the incorrect surface pressure reading have any implication on the accuracy of the model?

I know this topic has been raised by a different user before but seems not to have been answered.

Thanks for addressing this issue!

[gr3yw0lf]

hm...
have you tried to set the offset on your desktop pc via subsurface?

[Berthold]

Hi gr3yw0lf, Subsurface doesn't work for me as it doesn't connect to the OSTC. I'm using a MacBook, and I guess the software is not up to date on this system. Do you know of any other way to access the config?

Thanks for your thoughts!

[Berthold]

I'd like to get back to this topic. My OSTC+ pressure sensor still shows 30hPa too much (1053 instead of 1023). When traveling recently the sensor showed a similar discrepancy to the downside after flying. I cannot imagine this to be within the tolerances, or is it?

[gr3yw0lf]

hm...
tried the OSTC Companion?

https://heinrichsweikamp.com/index.php/service/software

[MatiasJoel]

Hey there! Sorry to hear about the pressure reading issue with your OSTC+ firmware 10.75. It's crucial for accurate data. The negative compensation value might be causing a glitch. We recommend reaching out to customer support for a more detailed solution. As for the accuracy, Workers compensation lawyeran incorrect surface pressure reading can affect your dive profile. It's always best to ensure accurate data for safety.

[heinrichsweikamp]

Hello,

The OSTC+ will use the surface pressure reading for the 0m reference. So, some hPa more or less will NOT affect your depth reading and this is not critical. A defective pressure sensor will show (intentionally) 9999hPa on the surface.

regards,
Matthias