Final answer:
Certified GPS systems for IFR enroute and terminal operations may be used to enable flight planning, real-time navigation, and adherence to air traffic control instructions, acting as primary navigation tools for pilots in poor visibility conditions.
Step-by-step explanation:
GPS systems that are certified for IFR (Instrument Flight Rules) enroute and terminal operations can be used for a variety of purposes within the aviation industry. These systems provide precise navigation capabilities that are crucial when flying under IFR, which is a set of regulations that allow an aircraft to operate in weather conditions that are not suitable for visual flight rules (VFR). When certified for IFR enroute and terminal operations, GPS systems can be used for flight planning, real-time navigation, and following air traffic control instructions.
For enroute operations, GPS can be the primary means of navigation over long distances, providing pilots with accurate positional data. Likewise, in terminal areas (the regions surrounding airports), a certified GPS aids in the execution of approaches and provides guidance for movements within controlled airspace. While using GPS for IFR operations, pilots can ensure adherence to the pre-defined flight routes, waypoints, and altitude restrictions that are part of IFR clearances. However, pilots must also be prepared to revert to traditional navigational methods in case of GPS failure or signal interference.