Originally Posted by
IRRenewal
The IRS is a standalone system that cannot be corrupted by GPS spoofing or jamming (unless of course the GPS position which you used to initialise the IRS was somehow corrupted, but I assume that is not what you are talking about).
If you do have some form of GPS outage your ANP will start going up. In the cruise this is unlikely to be a major issue as you still have IRS and Radio Position available. Not sure why your are asking about RNP. RNP is dictated by what and where you are flying, not by how good your GPS signal is.
I am sure all this is covered in your FCOM and FCTM
Thank you for the information, I am aware what is RNP, I just mentioned it as I wanted to check if ANP values on Legs page (RNP/ANP) go up when GPS spoofing is experienced. I went through the FCOM already but I was also looking for real life experience of Spoofing to get a feedback how exaclty it looked like and what can be expected if flying in affected region.
Fursty Ferret thank you very much for sharing your experience! It exactly what I was wondering if the same symptoms can be expected (Map shift, ANP value increasement, maybe even spurious PULL Up warnings etc.).
If anyone had experienced GPS Spoofing please feel free to share the experience here... Thank you!