Sure, but I was not speaking in context of aircraft, but e.g. of multi-day mountain trekking. Neither I have heard about OSMAnd to be used for a precise aircraft altitude control.
Dne 18/02/2018 v 00:39 Robert Grant napsal(a): > While my experience agrees with you regarding accuracy and stability, > it's still better to know the local pressure setting, especially if > landing an aircraft without a radio altimeter. Setting an altimeter > based on GPS sounds quite rare to me. > > On Feb 17, 2018 3:12 PM, "Poutnik" <[email protected] > <mailto:[email protected]>> wrote: > > As being trained in past as the military meteorologist, in pre-GPS > era, I am aware of that. But the offset value is bigger than GPS > accuracy of the static value averaged. BTW, the most handy way > how to calibrate the barometric altimeter at unknown altitude is > the GPS device. While barometric altimeters have superior > short-term accuracy and stability, GPS devices have superior > long-term accuracy and stability. Fortunately, for most personal > usage, absolute altitudes are not that important, rather the > relative changes. > > Dne 17/02/2018 v 23:35 Robert Grant napsal(a): >> I'm pretty sure that none of the devices listed by the op use >> barometric altimeters; even the Garmin Glo is GPS altimetry. GPS >> is known for its lack of precision in determining altitude. In >> aviation, old school barometric altimeters are still the gold >> standard, but they require periodic barometric pressure >> adjustment. While GPS is great for navigating around the earth, >> it would be very foolish to use GPS altitude for landing an >> aircraft. Bottom line: don't expect any phone with only GPS >> altitude to agree precisely with a database supplied measurement. >> >> >> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> >> Virus-free. www.avast.com >> >> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> >> >> >> >> On Sat, Feb 17, 2018 at 1:41 PM, Harry van der Wolf >> <[email protected] <mailto:[email protected]>> wrote: >> >> >> >> 2018-02-17 19:41 GMT+01:00 Poutnik <[email protected] >> <mailto:[email protected]>>: >> >> >> While Europe subtracts altitude by the correction, >> US adds altitude, so the higher value is the >> (over?)corrected one. >> >> >> I didn't know that :) >> >> -- Poutnik ( The Wanderer ) My Brouter profiles https://github.com/poutnikl/Brouter-profiles/wiki -- You received this message because you are subscribed to the Google Groups "Osmand" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
