[V-eHGsd_]

Having ff on an ipad and phone is really not having a “common point of failure”

You do you, but I find relying on a second device (third really, the plane has gps and nav radios) and battery backups much easier than buying a new chart supplement and a bunch of charts every 2 months. Plus I have all the approach plates for every airport …

trying to duplicate the functionality that I get from my setup with paper charts and plates is just practical.

[throw0101a]

> Having ff on an ipad and phone is really not having a “common point of failure”

The “common point of failure” is GPS, which does have regular local/regional outages. Your instruments may be able to use VOR/DMEs, and hopefully you're able to use the VOR MON:

* https://www.flyingmag.com/flying-the-mon/

* https://www.faa.gov/air_traffic/flight_info/aeronav/acf/medi...

But if you're relying on a GPS approach, you may be SOL (many places don't have ILS, and only visual and GPS).

[V-eHGsd_]

MON just means that there are a certain number of VORs that aren't going to be decommissioned. it's not a different kind of VOR. and they're decommissioning all of these VORs precisely because GPS is so reliable.

[sokoloff]

Having the same software app running on two devices is still subject to any faults in that software package (or their compilation of their database). I think it’s fair to call that a common point of failure.

You can judge that failure mode to be unlikely, of course, but you’re still making a judgment about an uncertainty.