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XM WX Accuracy

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robin1(at)mrmoisture.com
Guest

Posted: Fri Mar 28, 2008 10:06 am Post subject: XM WX Accuracy

Dear List,  

            I have been bugged for some time about the Winds Aloft readings I often get on my Garmin 396 using XM WX Aviator LT ($29.95/month) package. I have video footage of me flying in my RV-6A indicating 194 knots (Ground Speed) and a 90 degree Cross Wind component of 4 knots. I also have video of me cursing at the same altitude, same direction, same power settings indicating 140 knots (Ground Speed) which is well below my typical cruising speed and the XM wings aloft is indicating 0 knots.  

            I believe don’t actually receive the Winds Aloft data because of my pricing package (Aviator Lt) but I have no idea why the Garmin displays Winds data for me to misinterpret. I contacted XM, Real Weather (I think that is the data providers name) and Garmin with no satisfactory answer. Anyone know what data is showing up in the Garmin Winds data box?  

   

Thanks,  

Robin   

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wcurtis(at)nerv10.com
Guest

Posted: Fri Mar 28, 2008 10:38 am Post subject: XM WX Accuracy

You realize that Winds Aloft published by any weather service is a forecast right.  Does the 396 integrate forecast data with ground speed to extrapolate (non calculate since not enough data is provided) winds aloft?  I can't speak for the 396 but in order to calculate actual winds aloft, you need the Indicated altitude, CAS, barometer setting, temperature, heading AND ground speed.  If you have a full function GPS like the GNS-430/530, use the Density Alt / TAS / Winds function on the first page of the Aux menu--see page 134 of the GNS-430 manual.  This will give you VERY accurate Density Alt, TAS and wind component.  Without those additional data points, the portable 396 can only make a best guess on actual wind component.



William

http://nerv10.com/wcurtis/ 



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mike(at)learningplanet.co
Guest

Posted: Fri Mar 28, 2008 10:59 am Post subject: XM WX Accuracy

Robin,



When I signed up for my XM weather subscription I remember specifically having to fork out the extra $$ per month because the Winds Aloft wasn't part of the LT package. They tend to change their packages however, so you might want to check with XM. Clearly the Garmin shouldn't be showing any data if it is unreliable or unavailable, so there may be a software issue as well.

As far as accuracy goes, I get real-time wind information on the GRT EFIS, and most of the time the Winds Aloft data is pretty close. I only use winds aloft to get a general idea of what altitude I want to aim for. Sometimes the actual wind data causes me to adjust my plans.

Just one data point. I'm sure others will comment.

Regards,

Mike Schipper

RV-9A - N63MS - Flying - www.my9a.com

RV-10 #576 - Slow-build Fuselage - www.rvten.com



On Mar 28, 2008, at 1:03 PM, Robin Marks wrote: 	  Quote: 	
		  Dear List,

            I have been bugged for some time about the Winds Aloft readings I often get on my Garmin 396 using XM WX Aviator LT ($29.95/month) package. I have video footage of me flying in my RV-6A indicating 194 knots (Ground Speed) and a 90 degree Cross Wind component of 4 knots. I also have video of me cursing at the same altitude, same direction, same power settings indicating 140 knots (Ground Speed) which is well below my typical cruising speed and the XM wings aloft is indicating 0 knots.

            I believe don’t actually receive the Winds Aloft data because of my pricing package (Aviator Lt) but I have no idea why the Garmin displays Winds data for me to misinterpret. I contacted XM, Real Weather (I think that is the data providers name) and Garmin with no satisfactory answer. Anyone know what data is showing up in the Garmin Winds data box?

 

Thanks,

Robin



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gerf(at)gerf.com
Guest

Posted: Fri Mar 28, 2008 11:56 am Post subject: XM WX Accuracy

Something else to consider is the AGL your viewing data for  - closer to the ground the more the accuracy is likely to be affected by local  terrain - I can't imagine that they're compensating for that with any  reliability.  Case in point is the San Francisco Bay Area - I've  seen 180 degree variations from the forecast below 6,000' on my  496.

  

 Having said that -  compared to "VOR"s and DUATS these little  496s are almost magical, at this point it's on my critical equipment  list.

  

 Having said that - it runs on electrons and it's  programmed by geeks like me - bring  along your sectionals and always get a full weather briefing before  departing 

  

 g

  

 



   From: owner-rv10-list-server(at)matronics.com  [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Michael  Schipper

Sent: Friday, March 28, 2008 11:54 AM

To:  rv10-list(at)matronics.com

Subject: Re: XM WX  Accuracy

 

Robin, 



 When I signed up for my XM weather subscription I remember specifically  having to fork out the extra $$ per month because the Winds Aloft wasn't part of  the LT package. They tend to change their packages however, so you might want to  check with XM. Clearly the Garmin shouldn't be showing any data if it is  unreliable or unavailable, so there may be a software issue as well.

 



 As far as accuracy goes, I get real-time wind information on the GRT EFIS,  and most of the time the Winds Aloft data is pretty close. I only use winds  aloft to get a general idea of what altitude I want to aim for. Sometimes the  actual wind data causes me to adjust my plans.

 



 Just one data point. I'm sure others will comment.

 



 Regards,

 Mike Schipper

 RV-9A - N63MS - Flying - www.my9a.com

 RV-10 #576 - Slow-build Fuselage - www.rvten.com

 



 

 On Mar 28, 2008, at 1:03 PM, Robin Marks wrote: [quote]         Dear    List,

                  I have been bugged for some time about the Winds Aloft readings I often get on    my Garmin 396 using XM WX Aviator LT ($29.95/month) package. I have video    footage of me flying in my RV-6A indicating 194 knots (Ground Speed) and a 90    degree Cross Wind component of 4 knots. I also have video of me cursing at the    same altitude, same direction, same power settings indicating 140 knots    (Ground Speed) which is well below my typical cruising speed and the XM wings    aloft is indicating 0 knots.

                  I believe don’t actually receive the Winds Aloft data because of my pricing    package (Aviator Lt) but I have no idea why the Garmin displays Winds data for    me to misinterpret. I contacted XM, Real Weather (I think that is the data    providers name) and Garmin with no satisfactory answer. Anyone know what data    is showing up in the Garmin Winds data box?

   

   Thanks,

   Robin



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coop85(at)cableone.net
Guest

Posted: Fri Mar 28, 2008 2:19 pm Post subject: XM WX Accuracy

Along similar lines but slightly different, I’ve been frustrated at the update rate on my 496 WX on the METAR pages.  The map view cloud WX display is usually fairly fresh, but the META page is often several hours old and never seems to update even though the info is typically updated on the hour.    

   

Does anyone know how to force an update or improve the update rate?  I tried turning the machine off then on but didn’t really get a good response.  

   

Thanks,

 Marcus  

       

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Robin Marks

 Sent: Friday, March 28, 2008 1:03 PM

 To: rv10-list(at)matronics.com

 Subject: XM WX Accuracy  

  

  

   

Dear List,  

            I have been bugged for some time about the Winds Aloft readings I often get on my Garmin 396 using XM WX Aviator LT ($29.95/month) package. I have video footage of me flying in my RV-6A indicating 194 knots (Ground Speed) and a 90 degree Cross Wind component of 4 knots. I also have video of me cursing at the same altitude, same direction, same power settings indicating 140 knots (Ground Speed) which is well below my typical cruising speed and the XM wings aloft is indicating 0 knots.  

            I believe don’t actually receive the Winds Aloft data because of my pricing package (Aviator Lt) but I have no idea why the Garmin displays Winds data for me to misinterpret. I contacted XM, Real Weather (I think that is the data providers name) and Garmin with no satisfactory answer. Anyone know what data is showing up in the Garmin Winds data box?  

   

Thanks,  

Robin    	  Quote: 	
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        [quote][b]

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billderou(at)yahoo.com
Guest

Posted: Fri Mar 28, 2008 5:45 pm Post subject: XM WX Accuracy

I just finished integrating XM weather into my "for education" glass displays and this topic is fresh on my mind.

   

  The Aviator LT package ($29.99) does not provide winds aloft. The technical call regarding why the 396 has confused you should go to Garmin.

   

  Real time weather flows from the XM receiver every 5 minutes (almost on the second). TFR data is downloaded every 10 minutes. It is surprising how quickly the TFRs change. The central Metars database is updated from all stations each hour and transmitted every 10 minutes. The ZULU times at the leading edge of the metar should always be less than 70 minutes from actual ZULU time.

   

  Bill DeRouchey

  N939SB, now flying outside the Magenta

   

  



Marcus Cooper <coop85(at)cableone.net> wrote:

  [quote]              Along similar lines but slightly different, I’ve been frustrated at the update rate on my 496 WX on the METAR pages.  The map view cloud WX display is usually fairly fresh, but the META page  is often several hours old and never seems to update even though the info is typically updated on the hour.  <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

   

  Does anyone know how to force an update or improve the update rate?  I tried turning the machine off then on but didn’t really get a good response.

   

  Thanks,

Marcus

   

      From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Robin Marks

Sent: Friday, March 28, 2008 1:03 PM

To: rv10-list(at)matronics.com

Subject: XM WX Accuracy

   

  Dear List,

              I have been bugged for some time about the Winds Aloft readings I often get on my Garmin 396 using XM WX Aviator LT ($29.95/month) package. I have video footage of me flying in my RV-6A indicating 194 knots (Ground Speed) and a 90 degree Cross Wind component of 4 knots. I also have video of me cursing at the same altitude, same direction, same power settings indicating 140 knots (Ground Speed) which is well below my typical cruising speed and the XM wings aloft is indicating 0 knots.

              I believe don’t actually receive the Winds Aloft data because of my pricing package (Aviator Lt) but I have no idea why the Garmin displays Winds data for me to misinterpret. I contacted XM, Real Weather (I think that is the data  providers name) and Garmin with no satisfactory answer. Anyone know what data is showing up in the Garmin Winds data box?

   

  Thanks,

  Robin 

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coop85(at)cableone.net
Guest

Posted: Fri Mar 28, 2008 6:33 pm Post subject: XM WX Accuracy

Bill,  

    Thanks for the words.  My expectations are in line with your info about the METAR updates, but I routinely see ZULU times associated with the METAR info several hours old.  I guess I should give Garmin a call as there are certainly times when data that old can be misleading.  

   

Marcus  

     

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Bill DeRouchey

 Sent: Friday, March 28, 2008 8:42 PM

 To: rv10-list(at)matronics.com

 Subject: RE: XM WX Accuracy  

  

     

I just finished integrating XM weather into my "for education" glass displays and this topic is fresh on my mind.  

    

   

    

The Aviator LT package ($29.99) does not provide winds aloft. The technical call regarding why the 396 has confused you should go to Garmin.  

    

   

    

Real time weather flows from the XM receiver every 5 minutes (almost on the second). TFR data is downloaded every 10 minutes. It is surprising how quickly the TFRs change. The central Metars database is updated from all stations each hour and transmitted every 10 minutes. The ZULU times at the leading edge of the metar should always be less than 70 minutes from actual ZULU time.  

    

   

    

Bill DeRouchey  

    

N939SB, now flying outside the Magenta  

    

   

    



 

 Marcus Cooper <coop85(at)cableone.net> wrote:  

  [quote]    

Along similar lines but slightly different, I’ve been frustrated at the update rate on my 496 WX on the METAR pages.  The map view cloud WX display is usually fairly fresh, but the META page is often several hours old and never seems to update even though the info is typically updated on the hour.    

    

   

    

Does anyone know how to force an update or improve the update rate?  I tried turning the machine off then on but didn’t really get a good response.  

    

   

    

Thanks,

 Marcus  

    

   

        

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Robin Marks

 Sent: Friday, March 28, 2008 1:03 PM

 To: rv10-list(at)matronics.com

 Subject: XM WX Accuracy  

  

  

    

   

    

Dear List,  

    

            I have been bugged for some time about the Winds Aloft readings I often get on my Garmin 396 using XM WX Aviator LT ($29.95/month) package. I have video footage of me flying in my RV-6A indicating 194 knots (Ground Speed) and a 90 degree Cross Wind component of 4 knots. I also have video of me cursing at the same altitude, same direction, same power settings indicating 140 knots (Ground Speed) which is well below my typical cruising speed and the XM wings aloft is indicating 0 knots.  

    

            I believe don’t actually receive the Winds Aloft data because of my pricing package (Aviator Lt) but I have no idea why the Garmin displays Winds data for me to misinterpret. I contacted XM, Real Weather (I think that is the data providers name) and Garmin with no satisfactory answer. Anyone know what data is showing up in the Garmin Winds data box?  

    

   

    

Thanks,  

    

Robin   

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billderou(at)yahoo.com
Guest

Posted: Sat Mar 29, 2008 9:12 am Post subject: XM WX Accuracy

Thats correct Marcus-

  The data flows from the XM receiver without any commands after the initial setup. So any box receiving the data has the latest - but its the programmer of the box that chooses what to display.

   

  It is my opinion that the Metar data is just as important as the Nexrad visual. And, if your destination airport is close to the edge of a storm the Metar data becomes much more important than the Nexrad. Not having the latest available Metar is a safety issue.

   

  I have flown for 30 years and now after having GPS, TIS traffic and weather in my cockpit its mind boggling how I was able to fly with knowing so little.

   

  Bill

  



Marcus Cooper <coop85(at)cableone.net> wrote:

  [quote]              Bill,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

      Thanks for the words.  My expectations are in line with your info about the METAR updates, but I routinely see ZULU times associated with the METAR info several hours old.  I guess I should give Garmin a call as there are certainly times when data that old can be misleading.

   

  Marcus

   

    From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Bill DeRouchey

Sent: Friday, March 28, 2008 8:42 PM

To: rv10-list(at)matronics.com

Subject: RE: XM WX Accuracy



   

    I just finished integrating XM weather into my "for education" glass displays and this topic is fresh on my mind.



     



    The Aviator LT package ($29.99) does not provide winds aloft. The technical call regarding why the 396 has confused you should go to Garmin.



     



     Real time weather flows from the XM receiver every 5 minutes (almost on the second). TFR data is downloaded every 10 minutes. It is surprising how quickly the TFRs change. The central Metars database is updated from all stations each hour and transmitted every 10 minutes. The ZULU times at the leading edge of the metar should always be less than 70 minutes from actual ZULU time.



     



    Bill DeRouchey



    N939SB, now flying outside the Magenta



     



    



Marcus Cooper <coop85(at)cableone.net> wrote:



  [quote]    Along similar lines but slightly different, I’ve been frustrated at the update rate on my 496 WX on the METAR pages.  The map view cloud WX display is usually fairly fresh, but the META page is often several hours old and never seems to update even though the info is typically updated on the hour.  



     



    Does anyone know how to force an update or improve the update rate?  I tried turning the machine off then on but didn’t  really get a good response.



     



    Thanks,

Marcus



     



        From: owner-rv10-list-server(at)matronics.com  [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Robin Marks

Sent: Friday, March 28, 2008 1:03 PM

To: rv10-list(at)matronics.com

Subject: XM WX Accuracy



     



    Dear List,



                I have been bugged for some time about the Winds Aloft readings I often get on my Garmin 396 using XM WX Aviator LT ($29.95/month) package. I have video footage of me flying in my RV-6A indicating 194 knots (Ground Speed) and a 90 degree Cross Wind component of 4 knots. I also have video of me cursing at the same altitude, same direction, same power settings indicating 140 knots  (Ground Speed) which is well below my typical cruising speed and the XM wings aloft is indicating 0 knots.



                I believe don’t actually receive the Winds Aloft data because of my pricing package (Aviator Lt) but I have no idea why the Garmin displays Winds data for me to misinterpret. I contacted XM, Real Weather (I think that is the data providers name) and Garmin with no satisfactory answer. Anyone know what data is showing up in the Garmin Winds data box?



     



    Thanks,



    Robin 



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