Mxsmanic wrote:
writes:
The point is that even with SA, GPS accuracy is pretty good and has nowhere
near 2 orders of magnitude altitude error compared to lateral as you stated.
You call a 500-foot error in altitude good?
That's 492 feet with SA on, which as you've already acknowledged has been
off for a long time.
Absolutely wrong.
All I have to do is look at my GPS and watch it wander up and down by tens of
metres at a time. GPS is not designed for vertical accuracy.
YOUR GPS receiver is not designed for vertical accuracy because you are
too poor to be able to afford a decent one.
See the the data:
http://users.erols.com/dlwilson/gpswaas.htm
"The" data? It's just one person making experiments.
I can point you to dozens of sites with similar data and the GPS
specs as well, but you could just do it yourself and admit for once
that you are wrong.
If you knew anything about real flying, you would know that you NEVER
use GPS as your altimeter under ANY circumstances for reasons entirely
unlrelated to GPS accuracy.
What are those reasons related to, if not accuracy?
Regulations, the nature of real air, the way real airplanes fly and
common sense.
Beg for some money, give the money to a CFI, and it will be explained
in detail to you.
If it's as accurate as you seem to believe, it should be fine for IFR.
Regulations, the nature of real air, the way real airplanes fly and
common sense.
But how would you know as you have never been in a real airplane with
a real altimeter and a real GPS?
I've been using GPS for many years. It's almost useless for measuring
altitude.
YOUR GPS receiver is not designed for vertical accuracy because you are
too poor to be able to afford a decent one.
MY non-WAAS, aviation GPS receiver measures altitude that is within about
+/- 15 feet, or about +/- 4m, which is what everyone with a real GPS
gets.
So, to summarize:
You know nothing about GPS specifications.
You know nothing about aviation use of GPS.
Because you are such an arrogant, opinionated ass, you can't get a job
that would enable you to afford a decent GPS receiver.
That about sum it up?
I doubt the time accuracy on your piece of crap GPS is anywhere near
the nanosecond capabilities of a decent receiver either.
--
Jim Pennino
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