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10-26-2019, 10:31 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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I have both ADS-B and XM weather in my RV and use them for strategic route planning.
That said, I much prefer XM to ADS-B for the cloud tops and winds aloft. (If those are available on my SkyView's ADS-B, please speak up.)
I only activate the XM when I have a multiday trip and when I return, I cancel it.
$59.99 / month for local flying is a bit over the top, unless I'm traveling and if were to downgrade to $29.99 / month, I have ADS-B in, so why bother.
I would have thought that by now XM would have either killed their weather product or cut their prices in half to make their revenue on volume.
XM Pricing
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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10-26-2019, 10:34 AM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Quote:
Originally Posted by DanH
If anything, strategic weather information is more valuable for the cross-country VFR pilot, not less.
ms.
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+1 on this.
I used to have xm but it failed me on occasion- it thought I didn?t subscribe and needed to be re-initialized - requiring cell or internet contact to fix. (XM in my car and at home has done the same thing). After one trip where it really would have been nice to have but again wouldn?t work, I said screw this, I?ll keep the $400/yr and I switched to adsb. I still have the xm receiver installed but no way I?ll pay to get the data. For my flying - strategic avoidance - ADSB works just as well, even if long range data doesn?t look as pretty.
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10-26-2019, 01:01 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by N941WR
That said, I much prefer XM to ADS-B for the cloud tops and winds aloft...$59.99 / month for local flying is a bit over the top...
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Never saw much value in either with the -8, and getting them doubles the subscription price. Are you just doing it because of the -9's wing, popping to 15-18K when the winds are worth it?
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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10-26-2019, 01:14 PM
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Join Date: Jul 2015
Location: Aiken, SC
Posts: 620
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Quote:
Originally Posted by DanH
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When I first saw this graphic sometime after the accident, I assumed Scott decided to go out with his boots on, so to speak. No other reason to fly there . . . 
__________________
MED
140236
N435MD
Miss March 2020
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10-26-2019, 05:55 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by DanH
Never saw much value in either with the -8, and getting them doubles the subscription price. Are you just doing it because of the -9's wing, popping to 15-18K when the winds are worth it?
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Dan,
That is exactly why and how I used it. With oxygen, if I could climb high and pick up an additional 20 or 40 knots, it could make a significant difference on the trip.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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10-26-2019, 10:18 PM
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Join Date: Jan 2005
Posts: 959
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Quote:
Originally Posted by N941WR
That said, I much prefer XM to ADS-B for the cloud tops and winds aloft. (If those are available on my SkyView's ADS-B, please speak up.)
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I have the older, single band, -470 ADS-B IN receiver which provides the winds aloft forecast and is displayed in SkyView's airport WX tab (need to scroll down). The dual band -472 ADS-B IN receiver does the same.
I've read that the dual band -472 ADS-B IN receiver, with latest SkyView software (v15.4.7), will display traffic and weather, including the new items - lightning and cloud tops, in ForeFlight. Not sure if lightning and cloud tops are displayed on any of the SkyView models (Classic, Touch, SE, or HDX) but it seems like they should be.
Last edited by RV8JD : 10-26-2019 at 11:06 PM.
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10-27-2019, 08:14 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by N941WR
With oxygen, if I could climb high and pick up an additional 20 or 40 knots, it could make a significant difference on the trip.
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A glance at Weathermeister or similar tells the tale regarding winds that large, prior to launch. Winds are big picture stuff, with generally reliable forecasts.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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10-27-2019, 12:21 PM
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Join Date: Nov 2018
Location: Charlotte
Posts: 22
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Quote:
Originally Posted by BobTurner
Scott, not quite sure what you meant by the above quote. But IMHO, due to the latency, neither product is suitable for close in penetration of an area of thunderstorms. And, either product does a good job of long range strategic avoidance.
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Bob,
Certainly never mentioned anything about penetrating thunderstorms using the datalink weather. In fact, as I mention here in my blog that this kind of guidance is only used for strategic decision making. I was simply was implying that if you owned a more capable aircraft (certified IPS, pressurized, flying in the flight levels, active radar, etc) having SiriusXM is going to provide more consistent and useful guidance than that of FIS-B.
I am not a fan of the national level FIS-B radar. It has such a poor temporal and spatial resolution, it's pretty much useless. I'd rather have them drop that and extend the regional depiction by 100 miles given they are so bandwidth challenged.
__________________
Scott Dennstaedt
CFI & former NWS research meteorologist
Aviation author
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10-27-2019, 12:27 PM
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Join Date: Nov 2018
Location: Charlotte
Posts: 22
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Quote:
Originally Posted by rocketman1988
"...and allowed flight into a bad cell..."
Is there such a thing as a "good cell"?
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Actually it depends. Not all parts of a thunderstorm have dangerous convective turbulence. NASA studied this and found that areas where you see intense lightning often don't have the "turn you upside down" level of turbulence. In fact, there are some studies that have been ongoing to provide sensors on the aircraft to allow an air crew to know about what locations in a thunderstorm are safe to penetrate.
__________________
Scott Dennstaedt
CFI & former NWS research meteorologist
Aviation author
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10-27-2019, 12:35 PM
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Join Date: Nov 2018
Location: Charlotte
Posts: 22
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Quote:
Originally Posted by sailvi767
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I am not a fan of telling a pilot that the datalink radar depiction could be 15 to 20 or more minutes older. To me, that's just as bad of telling the pilot it's real time information. Sure, there are scenarios where this may happen such as missing a couple of broadcasts, but if you are getting consistent broadcasts, there's no way it'll be that old vs reality. All of this information is a gross vectoring aid and I only navigate around convection when I can do so in visual conditions. But when making those decisions based on location and speed of the weather, I never, ever use a 20 minute latency. 5-8 minutes is what I plan on especially given the recent upgrade to using MRMS and the faster updates from SiriusXM.
__________________
Scott Dennstaedt
CFI & former NWS research meteorologist
Aviation author
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