What is "VNAV enabled" in modern aircraft?

"VNAV enabled" refers to aircraft that are equipped with systems that support vertical navigation capabilities. This means that these aircraft have the necessary avionics and software to manage altitude changes and vertical flight profiles efficiently during various phases of flight, such as ascent, cruise, and descent.

VNAV allows pilots to follow predetermined altitude profiles that optimize fuel efficiency, ensure safe clearance above terrain, and maintain seamless integration with air traffic control instructions. This capability also aids in the planning and execution of approaches, enabling smoother descents and transitions in airspace.

In contrast, aircraft that are equipped solely for lateral navigation do not have the VNAV systems necessary to manage vertical profiles, and those lacking automation features or relying on traditional navigation techniques do not have the modern capabilities associated with VNAV-enabled operation.