Mark II Posted November 10, 2019 Report Share Posted November 10, 2019 Does anyone use a barometer mobile phone app and if so are they accurate Quote Link to comment Share on other sites More sharing options...
One on top of two Posted November 10, 2019 Report Share Posted November 10, 2019 Only if your phone has a proper barometer in built which I very much doubt . weather apps are NOT accurate... if they was there would be only ONE ! Quote Link to comment Share on other sites More sharing options...
Popsbengo Posted November 10, 2019 Report Share Posted November 10, 2019 yes but only gives you pressure at the station - no altitude corrections. Useful but I have to remember it's not local Quote Link to comment Share on other sites More sharing options...
Gandy Posted November 10, 2019 Report Share Posted November 10, 2019 38 minutes ago, Popsbengo said: yes but only gives you pressure at the station - no altitude corrections. Useful but I have to remember it's not local Use absolute pressure and it’s a guide if you have nothing else. I use the BBC weather app for what it’s worth. Quote Link to comment Share on other sites More sharing options...
Mark II Posted November 10, 2019 Author Report Share Posted November 10, 2019 Ok I have the Samsung s7 which apparently has a barometer built in so that might work. I am new to longer range shooting so excuse any daft questions. If it reads the pressure at your location does that mean you don't need to know your feet above sea level ? Quote Link to comment Share on other sites More sharing options...
Popsbengo Posted November 10, 2019 Report Share Posted November 10, 2019 35 minutes ago, Mark II said: If it reads the pressure at your location does that mean you don't need to know your feet above sea level ? that is right - provided the app isn't trying to correct for altitude and give you sea-level pressure (my Suunto will do that in some settings). Sea level pressure is what's given by national weather stations so it's standardised for all users irrespective of local altitude. What you are trying to correct for is actual "station pressure" ie where you are. Set your ballistic app to "station pressure" too. In general correcting for air pressure and/or altitude only makes a usable difference if you have recorded zeroing conditions to extrapolate from - ie station pressure or sea-level pressure with altitude when you zero (along with temp and humidity). What you are adjusting for is relative air density which is a combination of temperature humidity and pressure. If you know that, apologies for mansplaining. Quote Link to comment Share on other sites More sharing options...
Mark II Posted November 10, 2019 Author Report Share Posted November 10, 2019 36 minutes ago, Popsbengo said: that is right - provided the app isn't trying to correct for altitude and give you sea-level pressure (my Suunto will do that in some settings). Sea level pressure is what's given by national weather stations so it's standardised for all users irrespective of local altitude. What you are trying to correct for is actual "station pressure" ie where you are. Set your ballistic app to "station pressure" too. In general correcting for air pressure and/or altitude only makes a usable difference if you have recorded zeroing conditions to extrapolate from - ie station pressure or sea-level pressure with altitude when you zero (along with temp and humidity). What you are adjusting for is relative air density which is a combination of temperature humidity and pressure. If you know that, apologies for mansplaining. Thank you that makes perfect sense now Quote Link to comment Share on other sites More sharing options...
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