What is the primary benefit of using calibrated airspeed (CAS) in flight?

The primary benefit of using calibrated airspeed (CAS) is that it accounts for errors in instruments and installation. Calibrated airspeed is derived from indicated airspeed (IAS) after making corrections for instrument and position errors. These errors can arise from various factors, such as the way the airspeed indicator is calibrated or the effects of airflow around the aircraft that may cause discrepancies between IAS and the true airspeed.

When a pilot uses CAS, they are relying on a value that has been adjusted to reflect the actual conditions affecting the aircraft's performance. This makes CAS particularly valuable in situations where precise airspeed information is critical, such as during takeoff, landing, and when operating near stall speeds. By using CAS, pilots can ensure that they are making decisions based on accurate and reliable speed information, ultimately enhancing safety and performance during flight.

The other options do not accurately reflect the purpose or benefits of working with CAS. For instance, CAS does not provide ground speed measurements, which are influenced by wind conditions. Additionally, while CAS might be easier to interpret than IAS due to its corrections, the primary value lies in its accuracy regarding aerodynamic performance, not in the simplicity of its calculation. Finally, CAS alone does not guarantee accurate climb rate measurements,