Lateral sensitivity does not increase as the aircraft gets closer to the runway. LNAV (Lateral NAVigation) (aka GPS NPA) - A nonprecision approach that uses GPS and/or WAAS for LNAV. Check the chart notes (e.g., DME/DME RNP-0.3 NA). Certain RNAV (GPS) approaches are not available to these type units as the airplane could be beyond the service volume of a necessary DME facility. Some RNAV units use DME cross referencing (DME/DME) to achieve RNP 0.3.

All IFR-certified GPS units meet 0.3 RNP. Virtually all GPS approaches require an RNP (Required Navigational Performance) of 0.3, which means an aircraft tracking the final approach course with a centered needle can be expected to be within 0.3 nm of the centerline 95 percent of the time. RNAV GPS (aRea NAVigation) stand-alone instrument approaches have become commonplace as GPS and the Wide Area Augmentation System (WAAS) hit the mainstream.