How does VNAV assist with standard terminal arrival routes (STARs)?

VNAV assists with standard terminal arrival routes (STARs) by managing the vertical descent in a defined airspace. This means that during the approach and landing phases, VNAV allows pilots to follow a calculated vertical profile that aligns with the established STARs.

Using VNAV, aircraft can descend according to predefined altitudes and vertical speeds, which is particularly important in congested airspace where precise altitude management is crucial for safety and efficiency. The system interprets lateral and vertical navigation data, providing guidance on how to maintain the necessary altitude at various points along the STAR. This capability enhances the overall efficiency of the arrival process, reduces the workload on the pilot, and helps integrate the aircraft into the flow of traffic with minimal disruption.

The other options present concepts that do not align with how VNAV functions in relation to STARs, such as unrestricted vertical maneuvering or automatic altitude settings, which do not account for the specific protocols involved in STAR management.