Interesting... and what about altitude recorded in PAW logs?
What is the question, not sure I understand ?
which logs are you referring to, do you mean track files ?
If so, then we use 2 references GNSS(GPS) and PGRMZ(BARO)
so the track file info contains records of the form
$PGRMZ,1797,F,2*02
$GPGGA,160717,5050.874,N,00102.985,W,1,08,1.2,671.4,M,46.6,M,,*51
I was just always sure that somehow the baro altitude and GPS allows you to get the true altitude since with PAW in SkyDemon I always tend to see altitude super accurate when compared to my altimeter, however, when I use just my tablet GPS - then the output appears to be significantly off. But what you are saying is - I am likely seeing GPS altitude and for some reason it is very accurate (eg better receiver)?
Can't comment on the accuracy of location services TBH, apple do not declare how they calculate this, or what chipset they use
Thx
Lee