What must be ensured for IFR flight with non-WAAS GPS?

For IFR flight with non-WAAS GPS, it is essential to have approved and operational alternate navigation. Non-WAAS (Wide Area Augmentation System) GPS systems may not provide the same level of accuracy and reliability as WAAS-enabled systems, particularly in the context of precision navigation and approaches. Therefore, having a backup navigation system is critical in the event that the GPS fails or does not meet the required accuracy for the flight.

This might include using conventional navigational aids such as VORs (VHF Omnidirectional Range), NDBs (Non-Directional Beacons), or other approved methods of navigation that can guide the aircraft safely to its destination or to an alternate airport if necessary. Relying solely on non-WAAS GPS without an alternate means of navigation could lead to challenges in maintaining IFR requirements, particularly in conditions where precision navigation is critical.

While compliance with visual flight rules, flying under a certain altitude, or relying only on local VOR stations might seem relevant, they do not address the primary requirement for safe navigation in IFR conditions when using a non-WAAS GPS system. Thus, ensuring you have an operational and approved alternate navigation source is paramount for safety and compliance with IFR regulations.