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  #1  
Old 12-18-2021, 04:15 PM
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Aviator Aviator is offline
 
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Location: Chattanooga, TN ( Chattanooga)
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Default If VORs are going away...

So what will be the next big tech to take its place.
Already a LOT of em in our area are remarked inoperative, so perhaps its a prelude to them being gone. ( I have read from FAA and here about how they will keep most or some of them active for now, but I guess the writing is on the wall)
So if I have a GTN navigator without the Xi and have the itch to go Xi, I am thinking I should just wait a while.
Any thoughts on this.
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  #2  
Old 12-18-2021, 04:24 PM
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scrollF4 scrollF4 is offline
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Default

GPS navigation to VORs and for VOR approaches make the nav receiver seem unnecessary.

HOWEVER...

I absolutely love the fact that that same nav receiver enables me to fly LOC and ILS approaches, which are my preferred instrument procedure. The RNAV LPV is a very close second, assuming the RAIM is available.

My 2 cents.
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  #3  
Old 12-18-2021, 04:49 PM
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Thermos Thermos is offline
 
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The FAA is all in on WAAS GPS for the foreseeable future so your investment in an Xi won't be wasted. WAAS GPS and VOR will be what we have for enroute navaids until INSs become much smaller, much more accurate and much less expensive - and that probably won't happen anytime soon.

HTH

Dave
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  #4  
Old 12-18-2021, 06:23 PM
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Ed_Wischmeyer Ed_Wischmeyer is offline
 
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Quote:
Originally Posted by scrollF4 View Post
The RNAV LPV is a very close second, assuming the RAIM is available.
If I've got my facts straight, LPV requires WAAS which does not require RAIM.
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  #5  
Old 12-18-2021, 07:07 PM
Scott Hersha Scott Hersha is offline
 
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Location: Cincinnati, OH
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Somebody please translate. What is Xi? I assume it is something we all have and have had for years, but this is a new acronym for me that I haven’t seen before. (I don’t do Facebook, tweeter, iMe, or any of those other ‘things’ so I guess I’m in the dark). Forgive me, but please ‘splain’ what you are talking about.
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  #6  
Old 12-18-2021, 07:28 PM
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gmcjetpilot gmcjetpilot is offline
 
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Quote:
Originally Posted by Scott Hersha View Post
Somebody please translate. What is Xi? I assume it is something we all have and have had for years, but this is a new acronym for me that I haven’t seen before. (I don’t do Facebook, tweeter, iMe, or any of those other ‘things’ so I guess I’m in the dark). Forgive me, but please ‘splain’ what you are talking about.
It is Garmin's GTN Xi Series. Google is your friend. The term Xi means means eleven (roman numeral) or 14th letter in Greek alphabet.

https://www.garmin.com/en-US/blog/av...omm-solutions/
https://www.youtube.com/watch?v=ZdzUyxpv_fs
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Last edited by gmcjetpilot : 12-18-2021 at 08:42 PM.
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  #7  
Old 12-18-2021, 09:03 PM
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N804RV N804RV is offline
 
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Default VORs aren't going away...

As I understand it, the FAA's Minimum Operational Network (MON) will consist of 509 VORs with increased service volumes, as well as non-gps instrument approaches to at least 1 MON airport within 100 miles from anywhere in CONUS.

https://www.faa.gov/about/office_org...es/gbng/vormon
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  #8  
Old 12-19-2021, 05:46 AM
121mhz 121mhz is offline
 
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Default

Quote:
Originally Posted by Ed_Wischmeyer View Post
If I've got my facts straight, LPV requires WAAS which does not require RAIM.
You are correct. TSO-C129a GPSes use RAIM, TSO-146 use a different algorithm to calculate HPL and VPL (Horizontal and Vertical protection limits) and can use the WAAS signal to recognize an eliminate "bad" satellites.

RAIM calculations are included in WAAS GPSes, I believe, but are only used when WAAS signal is not being received (e.g. outside WAAS service areas, or during outages).
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  #9  
Old 12-19-2021, 05:49 AM
Skysailor Skysailor is offline
 
Join Date: May 2011
Location: Atlanta, GA
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Default RAIM

Quote:
Originally Posted by Ed_Wischmeyer View Post
If I've got my facts straight, LPV requires WAAS which does not require RAIM.
Actually, WAAS does require RAIM but most modern receivers perform the calculation on their own without requiring you to initiate the process. This is why you do not actually know the minimums line you will use on the approach until the unit annunciates it. Check your manual but usually within a cone (mine is 30 degrees of final approach course) the unit will display LNAV, LNAV+V or LPV. Even though you may have a WAAS IFR navigator and therefore think you need only brief and use the LPV minimums, the unit tells you based on the RAIM calculation it performs automatically. If LNAV is all that is annunciated, those are your minimums and procedures for this approach.
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  #10  
Old 12-19-2021, 07:02 AM
Scott Hersha Scott Hersha is offline
 
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Location: Cincinnati, OH
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Default

Quote:
Originally Posted by gmcjetpilot View Post
It is Garmin's GTN Xi Series. Google is your friend. The term Xi means means eleven (roman numeral) or 14th letter in Greek alphabet.

https://www.garmin.com/en-US/blog/av...omm-solutions/
https://www.youtube.com/watch?v=ZdzUyxpv_fs
George,
Thanks. It’s a Garmin thing. That “splains” it. When I googled Xi, all I got was Greek - nothing about Garmin.
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RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
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