This guide is published in order to help operators assimilate the specifications of RNP APCH navigation, which deal with RNAV(GNSS) approaches, and the associated implications. It does not supersede the existing regulations covering this subject. This guide sets out good practices for planning and carrying out the various types of approaches published under the name RNAV(GNSS). It highlights certain requirements that can be found either in EU OPS or in the EASA AMC. This guide is intended for public air transport operators, aerial work and general aviation operators and pilots operating aircraft (aeroplanes and helicopters) certificated for this type of approach, as well as IFR schools and training centres. Caution: This guide does not deal with "RNP AR APCH" approach procedures, generally referred to as RNAV(RNP), which require a particular operational approval process in accordance with EASA AMC 20-26.