Preliminary Assessment of Loran for Required Navigation Performance 1.0

As part of the ongoing Federal Aviation Administration (FAA) Loran evaluation, the system is being assessed for its ability to back up GPS through all phases of flight. While the focus has mainly been on supporting non precision approach (NPA), such as RNP 0.3, efforts have also been made to examine Loran for enroute RNP 1.0 operations. RNP 1.0 is important as it is the minimum requirement for automatic dependent surveillance – broadcast (ADS-B). The FAA is committed to deploying and utilizing ADS-B as an important part of the aircraft traffic surveillance infrastructure. RNP 1.0 capability enables Loran to provide back up to GPS for aircraft enroute guidance and surveillance.