NAS Implementation - Procedures - Lateral Navigation (LNAV) approaches
Lateral Navigation (LNAV) approaches are non-precision approaches that provide lateral guidance. The pilot must check RAIM (Receiver Autonomous Integrity Monitoring) prior to the approach when not using the Wide Area Augmentation System (WAAS) equipment.
Both LP and LNAV lines of minima are Minimum Descent Altitudes (MDA) rather than Decision Altitude (DA). It is possible to have LP and LNAV lines of minima published on the same approach chart. An LP is published if it provides lower minima than the LNAV. See AIM 1-1-20.
Example: RNAV (GPS) Y RWY 17L at Will Rogers World Airport, Oklahoma City, Oklahoma (OKC)