Surface pressure compensation

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Berthold
Posts: 3
Joined: Monday 23. January 2023, 11:40

Surface pressure compensation

Post by 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!
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gr3yw0lf
Posts: 107
Joined: Thursday 28. November 2019, 22:18

Re: Surface pressure compensation

Post by gr3yw0lf »

hm...
have you tried to set the offset on your desktop pc via subsurface?
life is better in fins

OSTC Plus #18168
Berthold
Posts: 3
Joined: Monday 23. January 2023, 11:40

Re: Surface pressure compensation

Post by 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
Posts: 3
Joined: Monday 23. January 2023, 11:40

Re: Surface pressure compensation

Post by 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?
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gr3yw0lf
Posts: 107
Joined: Thursday 28. November 2019, 22:18

Re: Surface pressure compensation

Post by gr3yw0lf »

life is better in fins

OSTC Plus #18168
MatiasJoel
Posts: 1
Joined: Tuesday 12. September 2023, 13:49

Re: Surface pressure compensation

Post by 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
Posts: 4385
Joined: Sunday 13. May 2007, 18:07

Re: Surface pressure compensation

Post by 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
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