LNAV – Lateral Navigation. The minima line on a chart for RNP approach without vertical guidance which does not require the use of SBAS.

LP – Localiser Performance: The minima line on a chart for RNP approach without vertical guidance which requires the use of SBAS. At some airports, it may not be possible to meet the requirements to publish an approach procedure to LPV minima. This may be due to: obstacles and terrain along the desired final approach path, airport infrastructure deficiencies, or the inability of SBAS to provide the desired availability of vertical guidance (i.e., an airport located on the fringe of the SBAS service area). When this occurs, a State may provide an RNP Approach to LP minima; an approach procedure with angular lateral guidance equivalent to a localizer approach, with lower minima than an RNP Approach to LNAV minima.