What must be done when utilizing RNAV systems for navigation to/from VOR, TACAN, or NDB?

When utilizing RNAV (Area Navigation) systems for navigation to and from VOR (VHF Omnidirectional Range), TACAN (Tactical Air Navigation), or NDB (Non-Directional Beacon), several operational considerations come into play to ensure safety and compliance with regulatory standards.

Staying above 3000 feet altitude is generally advised to avoid terrain and obstacle clearance issues while navigating. This altitude threshold helps to maintain safe separation from the ground, especially in mountainous or congested areas.

Using only pre-approved routes is crucial when employing RNAV, as these routes have been specifically designed and validated for use with RNAV systems. These pre-approved routes ensure that the navigation system can accurately follow the prescribed airways, thus maintaining safe and efficient air traffic flow.

Additionally, maintaining altitude within published parameters is essential to ensure an accurate and safe flight profile. Each RNAV route may have associated altitude assignments that are critical for avoiding collisions and optimizing airspace use.

Therefore, combining all these factors provides a comprehensive framework for safe RNAV operations, leading to the conclusion that all the specified actions must be adhered to when navigating with RNAV systems in relation to traditional navigation aids.