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Phantom 4 Pro - RTH without GPS
1098 10 2016-11-25
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fans6ea89672
lvl.3

Russia
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Is there ability RTH when GPS suddenly jammed?
2016-11-25
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Airobotix
Second Officer
Flight distance : 357310 ft
United Kingdom
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How can GPS / Glasnost be suddenly jammed?
2016-11-25
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Ange1walk
lvl.4
Flight distance : 30305 ft
Austria
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No.               
2016-11-25
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fansa84fe8a4
First Officer
Flight distance : 3 ft
United States
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Military has been doing a lot of funny GPS stuff lately with offsets and turning it off at times.  Check your FAA notices for upcoming NOTAMs like this one today that will encompass a 224 nm radius at 50' up from the Groom Lake area in Nevada:

https://www.faasafety.gov/files/ ... Flight_Advisory.pdf

I had one from China Lake Naval Weapons Station not too long ago too.  Commercial pilots may request ATC radar vectoring.

2016-11-25
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Labroides
Captain
Flight distance : 9991457 ft
Australia
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You shouldn't lose GPS unless you fly under cover or you have a bad compass calibration.
A GPS malfunction is extremely rare.

If you lose GPS for any of the reasons above your Phantom does not know where it is and cannot navigate to anywhere.

If you are simply flying in atti mode and sattelites are available, on losing control signal, RTH is initiated and the Phantom would use GPS to RTH.
2016-11-25
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Webheadfred
lvl.1
Flight distance : 124173 ft
United States
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Labroides Posted at 2016-11-25 15:22
You shouldn't lose GPS unless you fly under cover or you have a bad compass calibration.
A GPS malfu ...

The Feds can interrupt GPS for security reasons. Typically, a NOTAM will be issued if a VIP such as the President is in a location. This way any weapon targeting system relying on GPS would have a tough time with it. As a retired ATC'er, I've seen this more times than I can count.
2016-11-25
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Labroides
Captain
Flight distance : 9991457 ft
Australia
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Webheadfred Posted at 2016-11-26 16:28
The Feds can interrupt GPS for security reasons. Typically, a NOTAM will be issued if a VIP such a ...

Yes, they issue NOTAMs for VIP movement.
But have you seen them turn off GPS for that as well?
I've never heard of that and it sounds quite unlikely.

Those asking the questions are not in the USA so they'll never see such a thing anyway.
2016-11-25
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vad
lvl.3

Russia
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Airobotix Posted at 2016-11-26 03:12
How can GPS / Glasnost be suddenly jammed?

"12W Powerful 10 Antennas GPS WiFi Bluetooth LoJack UHF VHF 3G 4G Phone Jammer" cost only $369...
2016-11-27
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Geebax
Captain
Australia
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Labroides Posted at 2016-11-26 17:17
Yes, they issue NOTAMs for VIP movement.
But have you seen them turn off GPS for that as well?
I'v ...

And in any event, the GLONAS system would still be up and running. The Russians don't turn that off when Obama is on the move.
2016-11-27
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Cetacean
Captain
Flight distance : 2398540 ft
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United States
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Aloha fans6,

     No, the Phantom RTH function needs GPS / GLONASS to work.

Aloha and Drone On!
2016-11-28
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Glenn Goodlett
First Officer
Flight distance : 24540755 ft
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United States
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I have flown during these events well within the inner radius and never noticed anything out of the ordinary. I've been told the actual testing is a very short duration even though the NOTAN says it could last the entire time.

Always expect the worst and have a plan.
2016-12-9
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