GPS altitude again is close to actual

Recently, Ron Lee posted:

"Neil Gould" wrote:

Recently, Mxsmanic posted:

WAAS isn't part of GPS.

That comment may be helpful in a GPS newsgroup where the technology
is discussed in the absence of any application, however, in an
aviation newsgroup, discussions of GPS are primarily about the
application, and in that context WAAS is inseparable from GPS; in
other words, in aviation there is no application for WAAS
independent GPS AFAIK. So, your above claim is extremely off-topic,
at best.


Actually he is correct. WAAS is not part of GPS. You don't need WAAS
to use GPS for aviation.

No one said that one needs WAAS to use GPS for aviation. Obviously, there
are non-WAAS-enabled GPS receivers. However, do you know of some use of
WAAS in aviation that _doesn't_ involve GPS? I don't. If there isn't one,
then any discussion of WAAS in aviation necessarily includes GPS, and any
attempt to exclude it as "not part of GPS" is nonsense.

Neil

On Fri, 17 Nov 2006 14:56:29 -0600, "Gig 601XL Builder"
wrDOTgiaconaATcox.net wrote:


"Ron Lee" wrote in message
...
"Neil Gould" wrote:

Recently, Mxsmanic posted:

WAAS isn't part of GPS.

That comment may be helpful in a GPS newsgroup where the technology is
discussed in the absence of any application, however, in an aviation
newsgroup, discussions of GPS are primarily about the application, and in
that context WAAS is inseparable from GPS; in other words, in aviation
there is no application for WAAS independent GPS AFAIK. So, your above
claim is extremely off-topic, at best.

Neil

Actually he is correct. WAAS is not part of GPS. You don't need WAAS
to use GPS for aviation.

True but my GPS says WAAS enabled.


Ron Lee

Do you know of an aviation use of WAAS that isn't tied to GPS? That is the
issue.

I've never heard of any.
As we use it you can use GPS withoug WAAS , but not WAAS without GPS.
IOW it's an augmentation system.




Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

"Roger (K8RI)" wrote:
WAAS isn't part of GPS.

That comment may be helpful in a GPS newsgroup where the technology is
discussed in the absence of any application, however, in an aviation
newsgroup, discussions of GPS are primarily about the application, and in
that context WAAS is inseparable from GPS; in other words, in aviation
there is no application for WAAS independent GPS AFAIK. So, your above
claim is extremely off-topic, at best.

Neil

Actually he is correct. WAAS is not part of GPS. You don't need WAAS
to use GPS for aviation.

True but my GPS says WAAS enabled.


Ron Lee

Do you know of an aviation use of WAAS that isn't tied to GPS? That is the
issue.

I've never heard of any.
As we use it you can use GPS withoug WAAS , but not WAAS without GPS.
IOW it's an augmentation system.

Exactly, it is an augmentation system developed for and funded by the
FAA. The notion that WAAS is part of GPS is like saying that NDGPS or
CORS or any other separate systems that use or work with GPS are GPS
systems.

Of course WAAS cannot be used without GPS since it corrects GPS
signals and provides an integrity function. WAAS is worthless without
GPS but the converse is not the case.

Ron Lee

RomeoMike wrote:

No, but you need GPS to use WAAS, which enhances GPS accuracy in most,
but not all, of the continental USA. In that sense WAAS is certainly
part, albeit a newer part, of the GPS system.

WAAS is not part of the GPS.

Ron Lee

"Neil Gould" wrote:
:

WAAS isn't part of GPS.

That comment may be helpful in a GPS newsgroup where the technology
is discussed in the absence of any application, however, in an
aviation newsgroup, discussions of GPS are primarily about the
application, and in that context WAAS is inseparable from GPS; in
other words, in aviation there is no application for WAAS
independent GPS AFAIK. So, your above claim is extremely off-topic,
at best.


Actually he is correct. WAAS is not part of GPS. You don't need WAAS
to use GPS for aviation.

No one said that one needs WAAS to use GPS for aviation. Obviously, there
are non-WAAS-enabled GPS receivers. However, do you know of some use of
WAAS in aviation that _doesn't_ involve GPS? I don't. If there isn't one,
then any discussion of WAAS in aviation necessarily includes GPS, and any
attempt to exclude it as "not part of GPS" is nonsense.

Neil

No, it would be incorrect.

Ron Lee

Ron Lee writes:

I am not sure of all of MX's biases but GPS provides a far better
navigation, positioning and timing service globally, free than
anything he or his country has done.

This is incorrect. My country designed GPS.

--
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Ron Lee writes:

I thought he was European.

You've jumped to an incorrect conclusion concerning my nationality.
What does this imply with respect to your other assertions?

--
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Gig 601XL Builder writes:

For the purposes of GPS's use in aircraft it most certainly is.

It's important to understand the difference between GPS and WAAS. GPS
is a global satellite-based navigation system. WAAS is a regional
service that broadcasts estimated corrections to GPS positioning
information via satellite. WAAS actually depends on standard
surveying for its accuracy, not GPS.

--
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Neil Gould writes:

That comment may be helpful in a GPS newsgroup where the technology is
discussed in the absence of any application, however, in an aviation
newsgroup, discussions of GPS are primarily about the application, and in
that context WAAS is inseparable from GPS; in other words, in aviation
there is no application for WAAS independent GPS AFAIK.

There are no GPS aviation receivers that are not equipped with WAAS?
Are you sure? The GNS430 and GNS530 manuals I have in front of me say
nothing about WAAS, which would be quite an omission if they supported
it. And assuming that a GPS receiver supports WAAS when it does not
is very dangerous. (So is overestimating WAAS, but that's a separate
issue.)

--
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Gig 601XL Builder writes:

Do you know of an aviation use of WAAS that isn't tied to GPS?

Absolutely. GPS can be used (and is used) for en-route navigation
without WAAS. It is more than precise enough for this purpose for
lateral navigation. Standard GPS can be used for any lateral
navigation except during take-off and landing, where it is not
reliable enough for safety as the sole means of navigation. Many
existing aviation GPS receivers do not include support for WAAS.

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