RELEVANT DISCUSSION:
AIM 1-1-17 THROUGH 1-1-20, 1-2-1 THROUGH 1-2-3, 5-1-16, 5-3-4, 5-4-5 THROUGH 5-4-7, P/C GLOSSARY, OPSPEC C052, FAA-H-8083-16, AC 20-138, AC 90-97, AC 90-100, AC 90-101, AC 90-105, AC 90-107, AC 90-108, TSO-C161, TSO-C162, TSO-C196, FAA ORDER 8260.19
1. RNAV GPS (aRea NAVigation) standalone instrument approaches have become commonplace as GPS and the Wide Area Augmentation System (WAAS) hit the mainstream.
2. 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. All IFR-certified GPS units meet 0.3 RNP.
3. Some RNAV units use DME cross referencing (DME/DME) to achieve RNP 0.3. Certain RNAV (GPS) approaches are not…