Thanks folks,
I'm fairly comfortable with the need to navigate using conventional methods etc.
It just surprised me that WPT and STA might be available with a dual FMC failure and I'm interested if anyone knows the source of that information. I'm not planning for a sim check, just learning generally. It could be useful if you were oceanic to be able to bring up STA and WPT so I want to get an understanding of where the data comes from.
Thanks again.