What are the three basic categories of GPS/RNAV equipment?

The three basic categories of GPS/RNAV equipment are classified according to their functions and capabilities as they relate to Instrument Flight Rules (IFR). The correct choice identifies PGU (Positioning, Ground Control, and User), Mission Enhancement System, and Systems meeting Requirements for IFR flight as key categories.

The PGU represents the foundational aspect of GPS and RNAV systems, focusing on providing accurate positional information necessary for navigation. The Mission Enhancement System indicates equipment that enhances the capabilities of navigation systems, allowing for better situational awareness, performance, and safety during flight operations. Lastly, the designation of Systems meeting Requirements for IFR flight highlights systems that comply with regulations required for instrument flight, which is crucial for safety and operational effectiveness in diverse weather conditions and complex airspace.

Each of these components plays a vital role in modern aviation navigation and relies on sophisticated technologies to ensure precision and reliability, fundamental elements for instrument flight.