RNAV vs. RNP
 

Hi guys,
What is the different between RNAV and RNP?

That's a pretty vague question.

RNAV stands for A(R)ea (NAV)igation. Traditional Navigation involves flying between ground based radio aids like VORs and NDBs. RNAV involves feeding those signals into a computer to triangulate your actual position and allow you to fly to arbitrary waypoints. The best known form of RNAV is GNSS/GPS using satellites for triangulation. GPS is the primary source in most modern airliners, but if you lose that you still have DME/DME updating, VOR/DME etc...

RNP is a required navigation performance which is a requirement to operate under performance based navigation - PBN. Its basically RNAV with the addition of an on board alerting and monitoring capability.
RNP is also a statement of required navigational ability when operating within a certain airspace. RNP1 being accurate to within 1 NM, for approaches etc, RNP5 typical in the cruise and RNP10 with oceanic, with the ability to alert the crew when the Actual Navigation Preformance ANP does not meet thr RNP.

Just to confuse things, Approaches are referred to as RNAV, GPS, GNSS and RNP interchangeably...