Mxsmanic wrote:
writes:

YOUR GPS receiver is not designed for vertical accuracy because you are
too poor to be able to afford a decent one.

The GPS system is not designed for vertical accuracy. It was designed as an
aid to lateral navigation. The geometry of the system does not favor vertical
accuracy.

You are making yourself look the fool more than ever.

Both the specifications and typical results for vertical versus lateral
error for SA on, SA off, and WAAS are all less than 2:1, not the 100:1
you claim.

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.

I can point you to dozens of sites that "prove" that Denver's airport overlies
a huge alien base underground, but that doesn't make it so.

Sure, you can find kook sites, but that is an irrelevant red herring.

GPS error has been studied and results published on the web by lots
of univerities, major corporations, and government agencies, including
the NIST and the FAA.

The full specifications for GPS are publically available.

All say you are wrong, wrong, wrong.

Regulations, the nature of real air, the way real airplanes fly and
common sense.

If GPS were accurate, why would any of these other factors make a difference?

Start with the fact that not all real airplanes have GPS and not all real
airplanes that have GPS have WAAS capable GPS and no real airplane has a
"pause" key and see if you can figure it out.

I know a lot more about how GPS works than the typical CFI.

From your statements so far, i.e. vertical error is two orders of magnitude
greater than lateral error, it appears you know nothing about GPS other
than how to spell it.

They cannot be designed for vertical accuracy. The system itself is not
designed for that.

Wrong, wrong wrong.

You might try reading the actual GPS system specifications before you
make such inane statements.

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.

How do you know?

By looking at the displayed GPS altitude while on the ground and comparing
that to the published field elevation.

By looking at the displayed GPS altitude and comparing to the surveyed
altitude of my location, e.g. my house.

That should be obvious to anyone with more than two functioning brain
cells.

I doubt the time accuracy on your piece of crap GPS is anywhere near
the nanosecond capabilities of a decent receiver either.

Actually, they all need nanosecond accuracy.

Wrong again.

Time accuracy is a measure of the error in the GPS time of day output,
just like for position, which includes a 1 pps signal.

Most consumer grade GPS receivers do not contain the circuitry needed
for nanosecond accurate time of day output.

And before you make yourself even more a fool on this point too, you might
want to go see what the National Institute of Standards and Technology
has to say on the subject.


--
Jim Pennino

Remove .spam.sux to reply.