Barometer/Altimeter calculations

[Holton181]

I guess oruxmaps uses QNH for Barometer/Altimeter calculations.



I suggest that you add the possibility to use QFF for the calculations instead. Much better for "surface activities" like hiking, cycling etc (QNH is for aviation).

But the latitude and temperature needs to be provided.

Latitude from GPS.

Temperature from internal censor, ANT censor and/or possibly entered by user at altitude calibration. The last will not give correct altitude readings if the user is changing altitude far away from the calibration altitude (big vertical movement).



A good QFE-QNH-QFF calculator with formulas defined:

http://www.metpodengineering.com/qfe---qnh---qff-calculator.html">http://www.metpodengineering.com/qfe--- ... lator.html">http://www.metpodengineering.com/qfe---qnh---qff-calculator.html



I described the issue more in-depth in post 11 here:

http://www.oruxmaps.com/foro/viewtopic.php?f=3&t=2577&p=6329#p6329">http://www.oruxmaps.com/foro/viewtopic.php?f=3&t=2577&p=6329#p6329

[ofirgodoy]

+1

Excellent suggestion! I currently use an app called Barometer+ that has barometer calibration QNH automatically, is a great feature. I would love to see it implemented in Oruxmaps too.

https://play.google.com/store/apps/details?id=pl.baggus.barometr">https://play.google.com/store/apps/deta ... s.barometr">https://play.google.com/store/apps/details?id=pl.baggus.barometr

[Holton181]

Yes, I have that app myself, using ICAO codes for airports to get the most resent QNH.

But as I mentioned, Oruxmaps seems to have the QNH based calibration already. Oruxmaps calculates the QNH when you enter your calibration altitude.



What I'm asking for is an option to have QFF based calibration, that's a different thing, you need at least the temperature to do that.