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#1
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WAAS GPS approach question.
Hello,
I read on the Garmin page that their 480 is Waas certified...so that you can fly precision approaches without an ILS... what does this mean exactly? If I'm coming into an airport with only an NDB approach, can I use the 480's capabilites to fly a precision approach and get down to a lower MDA/DH? -dr |
#2
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WAAS GPS approach question.
Hello,
I read on the Garmin page that their 480 is Waas certified...so that you can fly precision approaches without an ILS... what does this mean exactly? If I'm coming into an airport with only an NDB approach, can I use the 480's capabilites to fly a precision approach and get down to a lower MDA/DH? It means you can use the LPV minima line on a RNAV(GPS) approach chart, and that assuming your 480 was properly installed you can follow localizer-like and glideslope-like needle guidance on that approach. |
#3
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WAAS GPS approach question.
"Dico" wrote in message oups.com... Hello, I read on the Garmin page that their 480 is Waas certified...so that you can fly precision approaches without an ILS... what does this mean exactly? If I'm coming into an airport with only an NDB approach, can I use the 480's capabilites to fly a precision approach and get down to a lower MDA/DH? If the airport has only an NDB approach, how are you going to fly a GPS approach of any sort? |
#4
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WAAS GPS approach question.
Can you use the 480's glideslope to guide you into a VOR approach that
is NOT GPS, but using a descent gradient that will hit the altitude at the waypoints as charted? Same approach as flying it by hand, just a stabilized, even descent. Hope that makes sense. |
#5
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WAAS GPS approach question.
"Matt Barrow" wrote in message ... "Dico" wrote in message oups.com... Hello, I read on the Garmin page that their 480 is Waas certified...so that you can fly precision approaches without an ILS... what does this mean exactly? If I'm coming into an airport with only an NDB approach, can I use the 480's capabilites to fly a precision approach and get down to a lower MDA/DH? If the airport has only an NDB approach, how are you going to fly a GPS approach of any sort? In other words, if there isn't a published approach, you can't invent one for your own use. It's not legal and not safe. |
#6
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WAAS GPS approach question.
"Doug" wrote:
Can you use the 480's glideslope to guide you into a VOR approach that is NOT GPS, but using a descent gradient that will hit the altitude at the waypoints as charted? Same approach as flying it by hand, just a stabilized, even descent. Hope that makes sense. Assuming it's a VOR(GPS) approach, and not a circle to land only, Yes. The 480 provides VNAV guidance suitable for LNAV/VNAV or if not charted, then referred to as "advisory VNAV", but basically it works the same - you get vertical guidance to the runway. Mike |
#7
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WAAS GPS approach question.
Dico wrote:
If I'm coming into an airport with only an NDB approach, can I use the 480's capabilites to fly a precision approach and get down to a lower MDA/DH? -dr No. But if you have an RNAV approach with precision/vertical guidance component, (and I am presuming the approach lighting is up to snuff before that type of approach chart is issued).. then you could use the 480 box to execute that approach without any ground based navaid guidance. Dave |
#8
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WAAS GPS approach question.
WAAS Approaches have vertical guidance but they
are not classified as "Precision" Bill Hale |
#9
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WAAS GPS approach question.
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#10
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WAAS GPS approach question.
Officially, LPV refers to "Localizer Performance with Vertical
Guidance". Officially it's not precision, perhaps not-so-non-precision. With horizontal and vertical accuracies in the 1-2m range, its arguably more accurate than a Cat III ILS. It does not however,have the integrity of a Cat III. The LPV approach does indeed have a decision altitude which currently is as low as 250ft HAT, and the recent approval of 200' DA's will likely start showing up on procedures next year. Brad |
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