NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Unwarranted levels of precision
From: Peter Monta
Date: 2017 Dec 20, 13:59 -0800
From: Peter Monta
Date: 2017 Dec 20, 13:59 -0800
I once read a newspaper report that the aircraft was flying at 304.8m.
Sounds legit :-). With GNSS you can add another decimal place. Given the short range, a laser tracker might work, and so add another two decimal places on top of that (but you get only relative height---there's no tie to a global frame as with GNSS).
If you want orthometric or dynamic height rather than ellipsoidal/geodetic/ITRF height, though, you're limited to the uncertainty of the geoid, a few centimeters.
Cheers,
Peter
