I was reading a recent CAA publication which outlined the RNP for approval as a primary approach aid - and all of the reasons why the current GPS system does not meet these requirements. After monitoring the NDB 20 approach into Shoreham (with 35 knots declining to 20 on the surface from 280 and very gusty) on the GNS430 I thought - does this NDB approach meet the RNP requirements.
Assuming you're referring to the document WarpedFactor cited, it's worth reading carefully. The "RNP" are the
Aviation Operational Performance Requirements for GNSS. In other words, they are not generic requirements, they only apply to sat nav.
Any conclusions drawn by the Civil Aviation Authority merely underline their position as the brightest national aviation authority in the UK.
