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Thanks for the replies. You've answered my question regarding RNP from a cockpit perspective. Required Navigation Performance will be used by Westjet Airlines to certain Canadian airports that have terrain issues. From what I understand, RNP approaches can guide an aircraft that is in IMC conditions around all terrain down to 250' AAE. I think this is absolutely fascinating technology. I'm sure it's nothing new, but it is one huge step beyond ground-based navigation instruments, such as ILS's and NDB's. With this technology will come huge fuel savings for everyone, and hopefully a smoother operation from an air traffic perspective.
If anyone has anything to add (or correct) to this thread I would greatly appreciate it, as I am trying to gain an understanding of how RNP will change air traffic procedures.
Ken