GPS Outage?

[exM20K]

Today around 1:00PM CST, Igot a voice annunciation “terrain not available” and a “no GPS position message” on both displays.  I have two receivers.  It corrected itself in a few minutes.  Is it possible this was a GPS outage or local Interference.?

-Dan 

[exM20K]

Also had LOI showing on HSI display.  Is Loss of Integrity 

[hammdo]

Notams will tell you. I ck them often. Flying west of DFW near New Mexico they can reach 400 NM from origin... 

-Don 

[exM20K]

Not just me.  Our local flying club has seen this over the last couple days.

https://youtu.be/29nwLTRTOXY

kinda not great considering we have only a GPS approach into here.  How do you go missed if the new 5G tower or whatever blocks GPS?

[1964-M20E]

yeah let's get rid of VORs

[kortopates]

Local interference or jamming most likely. bring up the satellite page next time - it will show zero satellites being received when it’s interference or jamming. we would have to loose several satellites before we had an “outage” and then we would see our position degrade from 3d to 2d - not going to happen. there are 32 of them up there IIRC.


Sent from my iPhone using Tapatalk

[N201MKTurbo]

https://notams.aim.faa.gov/notamSearch/nsapp.html#/results

Look here for interference testing.

[exM20K]

@kortopates that is what the club plane shows in the video.

@N201MKTurbo nothing was in the notams; it appears this is 5G related.  Our junior Senator, who is very good on GA issues, has sponsored a senate bill to compensate for whatever damages are incurred (eg: purchase and installation of filters on GPS receivers), and I've offered to provide written or in-person testimony / data logs.  

-dan

[N201MKTurbo]

11 minutes ago, exM20K said:

@kortopates that is what the club plane shows in the video.

@N201MKTurbo nothing was in the notams; it appears this is 5G related.  Our junior Senator, who is very good on GA issues, has sponsored a senate bill to compensate for whatever damages are incurred (eg: purchase and installation of filters on GPS receivers), and I've offered to provide written or in-person testimony / data logs.  

-dan

You are assuming it is 5G related. It may be. It may not be. There are plenty of things in this world that emit broadband RF interference that could do that. Not to mention illegal GPS jammers that are readily available on the web. Have you reported it to the FAA and the FCC?

[Mooneymite]

I got those messages a couple of times, momentarily prior to my GPS antenna failing completely.

[exM20K]

1 hour ago, N201MKTurbo said:

You are assuming it is 5G related. It may be. It may not be. There are plenty of things in this world that emit broadband RF interference that could do that. Not to mention illegal GPS jammers that are readily available on the web. Have you reported it to the FAA and the FCC?

Yes, that is the assumption, and you are correct that it could be unrelated jamming or interference.  We have reported it to the FAA/FSDO.  My understanding is, though, that there has been a recent rollout of 5G service local to us.  I don’t know if this is true or if true, responsible for this interference.  
-dan

[exM20K]

1 hour ago, Mooneymite said:

I got those messages a couple of times, momentarily prior to my GPS antenna failing completely.

Difference is that this has hit multiple GPS receivers with different antennas in the same plane on at least three occasions in the last few days.

[Mooneymite]

11 minutes ago, exM20K said:

Difference is that this has hit multiple GPS receivers with different antennas in the same plane on at least three occasions in the last few days.

Ha!  There is a failure mode that blocks all GPS reception around the failed antenna.  None of my GPSs worked....handheld/tablet/nothing.  Garmin is well aware of this failure mode, but does not (for obvious reasons) publicize it.  Check the MS archives.  If you come across this failure mode, try completely un-powering the GPS attached to the offending antenna.  Miraculously, the other GPSs will lock on.

[tony]

On 11/24/2021 at 7:55 AM, 1964-M20E said:

yeah let's get rid of VORs

what's a VOR?

[hais]

6 hours ago, tony said:

what's a VOR?

@tony that's a navigation system designed for the sole purpose of failing students in their instrument checkride

[Danb]

43 minutes ago, hais said:

@tony that's a navigation system designed for the sole purpose of failing students in their instrument checkride

And I thought that was an ADF 

[Jim Peace]

5 hours ago, Danb said:

And I thought that was an ADF 

What is an ADF?

[hais]

38 minutes ago, Jim Peace said:

What is an ADF?

ADF is an advanced mode of navigation. Rather than the cumbersome direct-enter-enter, you have an arrow that automatically finds the waypoint - hence the A in ADF.

[Jerry 5TJ]

I think the A stands for “approximate.”

[hais]

4 hours ago, Jerry 5TJ said:

I think the A stands for “approximate.”

Isn't that too generous?

[Air pirate]

On 11/26/2021 at 7:44 PM, Jim Peace said:

What is an ADF?

It’s for listening to a game on AM radio 

[Jim Peace]

6 minutes ago, Air pirate said:

It’s for listening to a game on AM radio 

you can just ask scores on guard frequency for that...