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.
