This document contains Minimum Operational Performance Standards for single-frequency airborne navigation sensor equipment not augmented by ground or space-based systems. The standards define minimum performance@ functions and features for GPS sensors that provide position information to a multisensor system or separate navigation system. They also address Area Navigation (RNAV) equipment to be used for the en route@ terminal@ and Lateral Navigation (LNAV) phases of flight. The basis for this document is RTCA/DO-229D - MOPS for GPS/WAAS Airborne Equipment@ Class Beta 1 receiver without SBAS requirements. In comparison with the older GPS MOPS - RTCA/DO-208... the document reflects: An updated signal operating environment (updated interference environment)@ The absence of Selective Availability (SA) (which was turned off on May 1st 2001 as a result of a Presidential Directive)@ Updated RAIM (Receiver Autonomous Integrity Monitoring) for GPS and@ Optional GPS receiver velocity accuracy and velocity FOM (Figure of Merit) computation. Note: WAAS: Wide Area Augmentation Systems ABAS: Aircraft Based Augmentation System