GPS altitude again is close to actual

writes:

You don't understand how WAAS works.

The corrections are to grid points based on observables from multiple
reference stations.

The corrections are based on data from only 29 stations, but they are
extrapolated to an entire continent. This inevitably increases
inaccuracies. It's as simple as that.

That's why LAAS exists, which uses reference points that are at the
same location as the location for which corrections are being
provided.

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Ron Lee writes:

I suspect that Jon is far smarter on WAAS that either one of us Mx.

I don't have to be smart: I look things up.

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Nomen Nescio writes:

Actually, at least for the most part, they are INTERpolations.
There's a big difference.

Not in terms of accuracy. Either way, they are _estimates_.

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RomeoMike writes:

Go to http://www.garmin.com/pressroom/aviation/110906.html and read "enabled."
The new ones are enabled, the old ones upgradeable.

The new ones have a different model number, e.g., 530W instead of 530.

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RomeoMike writes:

Look harder. Old ones are upgradeable, new ones are enabled, which means
enabled, not "equipped with."

The ones I referenced are upgradeable.

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Mxsmanic wrote:
Ron Lee writes:

I suspect that Jon is far smarter on WAAS that either one of us Mx.

I don't have to be smart: I look things up.

That explains a lot.

Mxsmanic wrote:
writes:

You don't understand how WAAS works.

The corrections are to grid points based on observables from multiple
reference stations.

The corrections are based on data from only 29 stations, but they are
extrapolated to an entire continent. This inevitably increases
inaccuracies. It's as simple as that.

You stated:

" The further away you are from the surveyed reference
position used to generate the corrections, the more likely it is that
your position will be incorrect."

Until you recognize that your above claim is patently false, your
replies are of little value.

It's as simple as that.

But I don't expect you to given what I've read in other threads you've
'participated in'...

Mxsmanic wrote:



GPS errors can easily exceed 100 feet.


And it is exceedingly rare that they do.


And 100 feet sounds pretty
significant for RVSM.


It is not.






Unless death awaits above.

It does not.






How wasteful of manufacturers to produce altimeters that provide
accuracy better than the nearest 100 feet.

Irrelavant.






You make mistakes and die.


No, very few mistakes cause death.






I make mistakes and learn. Simulation
affords the opportunity to make mistakes safely and teaches humility.


So does actual flying.

Mxsmanic wrote:


Another problem, not actually part of GPS per se, is moving maps.
Your GPS position may be accurate, but that doesn't guarantee that the
map is accurate. If the mountain on the map is in the wrong place in
relation to its real-world position, having high accuracy from GPS
won't help you. Very often map errors are more of a problem than
errors in the GPS itself.


Once again you don't know what you're talking about. Even if the map
were out of spec a little it doesn't matter as you aren't flying that
close to the mountains if you are IFR. An actual pilot would know that.




Note that WAAS and LAAS will _not_ compensate for either of the above
types of error.

Doesn't matter.





Differential GPS systems like this work best when you
are at exactly the spot used as a reference for the corrections. If
you are anywhere else, the corrections may not be right for your
position. The further away you are from the surveyed reference
position used to generate the corrections, the more likely it is that
your position will be incorrect.

Completely irrelavant for aviation.

"Mxsmanic" wrote in message
...
Nomen Nescio writes:

One thing you keep missing as a "pretend" pilot is that an error of
+/- 100 ft is insignificant in the real world.

GPS errors can easily exceed 100 feet. And 100 feet sounds pretty
significant for RVSM. With errors that large, some aircraft may be
vertically separated by only slight more than the spans of their
wings.

But as I've said, as PIC, you do what you want.

If a 100 ft error on the GPS is the difference between life and death,
a real pilot will climb.

Unless death awaits above.

It matters very little that you show that you are 5500 ft msl when you
are actually
5400 ft. you ain't gonna crash and you're no more likely to have a
mid-air
than flying at 5500.

How wasteful of manufacturers to produce altimeters that provide
accuracy better than the nearest 100 feet.

This is the difference between the REAL world that we live in, and the
FANTASY world that you live in. We live it and KNOW. You read it and
pretend to be an expert.

You make mistakes and die. I make mistakes and learn. Simulation
affords the opportunity to make mistakes safely and teaches humility.

Your simulator affords you the opportunity to play a game........nothing
more, nothing less.


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