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1 19th February 12:27
marc adler
External User
Posts: 1
Default FSX and WAAS

Does anyone know if FSX will simulate WAAS?

Oh, wait a second. Does FS9 simulate it?

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2 19th February 20:38
External User
Posts: 1
Default FSX and WAAS

I haven't recently searched the usual download sites for a WAAS-enabled,
IFR-certified GPS unit, but most certainly the default FS2004 GPS and the
RealityXP Garmin GNS430/530 add-ons do NOT simulate WAAS functionality for

As far as FSX, I suspect that out of the box it does not, but I would hope
that someone might make an add-on that does. Since I have not actually
played with FSX, this is only speculation.

As of this writing, there is only one IFR-certified GPS available for WAAS
approaches in the US and that unit is the Garmin GNS480. Garmin bought
this unit when they bought out the company that originally manufactured
this GPS. That company was, believe it or not, a division of UPS (the
shipping company).

As you may have seen in another thread, Garmin had also promised to release
an upgrade for owners of the Garmin GNS430/530 series, but this upgrade
continues to slip, even beyond their latest promised date of sometime
October 2006.

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3 21st February 00:51
marc adler
External User
Posts: 1
Default FSX and WAAS

So is WAAS going to be the wave of the future then? (Total speculation
invited <g>).

Actually makes a lot of sense.

Yeah, I noticed that. Also mentioned was something about glass ****pits
with WAAS built in. Does that mean I'll have to forget all the VOR/ILS
stuff I'm learning now? (Again, speculation welcome.) How does WAAS
work for landings, anyway? Is there a glidescope and all that?

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4 21st February 00:51
jay beckman
External User
Posts: 1
Default FSX and WAAS

Short Version:

As far as how things work in the USofA, if there is a GPS or GPS Overlay
approach that has been mapped out by the FAA, a WAAS-enabled GPS will be
able to fly a precision approach (with lateral and vertical guidence) to any
runway, at any airport, anwywhere, anytime better than if there was an
actual ILS.

I attended an AOPA open house about a year ago and they had a video showing
a traditional coupled ILS approach on the left side of the screen and a
WASS-enabled, GPS-coupled approach on the right side. Relativly speaking,
the "****og" ILS approach looked like it was being flown by a drunken sailor
while the GPS RNAV/VNAV needles never moved even the least little bit.
Quite impressive.

Jay B

PS...I find it really interesting that I can take my terestrial GPS (a
Garmin V Plus) up flying with me and because it's WAAS enabled, it can
actually find a point in space more closely (to within 3' when it's running
really tight...) than the KLN94B GPS that is mounted in the panel of our
club 172SP.
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5 21st February 17:22
External User
Posts: 1
Default FSX and WAAS

Jay, a couple of minor corrections. At this point in the US many of the
existing GPS approaches are not certified as WAAS approaches. That is,
many GPS approaches do not offer the lowest minimums (ceilings and vis) to
those with WAAS-enabled, IFR-certified GPS's.

Below is an example of such an approach. WAAS enabled or not, you only get
to fly to the non-precision GPS minimums (LNAV minimums row of the minimums
table at the bottom of the chart) on this GPS approach into Lake Placid,

What I will admit to not knowing, however, is that whether a WAAS-enabled
GPS will provide the pilot a glideslope-like descent to the MDA on
approaches such as this one, rather than approach-course guidance only that
requires the pilot to "dive and drive" each step of the approach.

There *may be* a feature of WAAS-enabled GPS's that present a glideslope
descent to the MDA of approaches like this, which would be pretty cool.
I'll let you know in a few months when my aircraft's GPS is upgraded to
WAAS. The theory here is being that a stabilized, 3 degree descent,
like those flown on an ILS, is safer than a step-down pattern used on
non-precision approaches.

Continuing, a GPS approach has to be certified as a WAAS-approach before
the FAA will let those with the WAAS GPS's fly a glideslope-like approach
to low minimums using their GPS.

Additionally, if an approach is a GPS overlay approach (which means that
the FAA took the approach course, minimums, and fixes of an existing VOR or
NDB approach and authorized the approach to be flown using an IFR-certified
GPS using the same approach details), then most likely it cannot be a
candidate for a WAAS approach as well, since most likely the final approach
course of the approach is not aligned with the runway to a point where the
FAA could grant the lowest minimums possible. Call this an educated

And finally, when compared side-by-side with WAAS-enabled GPS approaches,
ILS approaches offer lower minimums and it will be this way for the known
future. From the rumors that I have heard, the FAA still has some inherent
concern about GPS being 100% accurate for 100% of the time, so the proven
technology of the ILS system reigns supreme.

Check this out. Here is a GPS with LPV (WAAS-enabled) minimums to rwy 28
at my home airport:

And here is the ILS to the same runway:

Notice that the ILS has a decision height of 613 and a visibility of 1800
RVR (1,800 feet), whereas the LPV minimums of the GPS approach only go as
low as 740 feet and 4000 RVR (4,000 feet).

Given the choice, I would pick an ILS over the LPV approach to this runway
for the simple reason that the minimums are lower.

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6 21st February 17:22
External User
Posts: 1
Default FSX and WAAS

It is the next step for those who fly IFR with an IFR-certified GPS, yes.
However, VFR pilots most likely will not make the leap, since the increased
accuracy of a WAAS-enabled GPS would not be used in VFR flight.

Furthermore, as Jay eluded in his post, WAAS-enabled GPS's will open the
door for the FAA to be able to provide precision approaches, similar to an
ILS approach, at smaller airports that would never have had the money to
install ILS equipment. This, in turn, will theoretically improve safety of flight.

ILS won't go away in the next twenty years, if I had to speculate.
Additionally, you probably won't see VORs go completely away either as
there are many aircraft that only have VOR receivers for navigation.

The GPS calculates, then presents a glideslope to the pilot.

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7 22nd February 02:24
External User
Posts: 1
Default FSX and WAAS


How does one pronounce WAAS?



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8 22nd February 02:24
External User
Posts: 1
Default FSX and WAAS

After all those words this is the question you come up with???


I have heard it pronounced as "waasss" and that is what I have adopted but
like SCSI, which people pronounce as either ***Y or SCUZZY (my preference),
I am sure that there will be multiple, correct pronunciations.

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9 22nd February 02:24
frank stutzman
External User
Posts: 1
Default FSX and WAAS

As I understand from talking to pilots who have done these approaches, you
do indeed get a stabilized, 3 degree descent.

I forsee a problem in the future for us bug-smashers, though. I'm
guessing that when WAAS is in full use, the "dive and drive" non-precision
approaches will not be certified and every new approach will be LPV. Why
is that a bad thing? Because there are many, many airports that will end
up having very high minimums because of terrain in the approach path.
This isn't a problem for the commercial carriers because they don't
typically go to airports that have these problems.

I have a local company ( that has something better, IMO.
Its called a Transponder Landing System. It interogates the planes
transponder, geometrically calculates the planes position, and then
broadcasts left/right, up/down guidance on a ILS frequency. Lots of
advantages: ILS like minimums, non-straight approach paths, minimal
equipment in the plane, no database, cheaper ground equipment.

They had an experimental set up done at one of my local airports and I
played with it. From the pilots perspective, its pretty much like flying
an ILS. Does require a person on the ground, but any line boy could do it.
Alas, ANPC has to deal with the FAA. In the past few years I think they
have given up on doing this for the civilian world and are focusing on
military applications.

Frank Stutzman
Bonanza N494B "Hula Girl"
Hood River, OR
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10 22nd February 02:24
External User
Posts: 1
Default FSX and WAAS

Interesting. This will be interesting to see first-hand.

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