Why is it important to have the correct altimeter setting?

Having the correct altimeter setting is crucial for ensuring that the altimeter provides an accurate readout of the aircraft's true altitude above sea level. This is particularly important because pilots rely on altitude readings to maintain safe separation from terrain and other aircraft, especially in turbulent or low-visibility conditions.

When the altimeter is set incorrectly, it can lead to dangerous situations, such as flying too low to the ground without realizing it or misjudging the appropriate altitude during approaches and landings. True altitude refers to how high the aircraft is above sea level, and having the correct setting ensures pilots can accurately interpret their aircraft's altitude relative to the ground. This is essential for safe navigation and adherence to air traffic control instructions, especially near airports and mountainous areas.

Accurate altitude readings also play a significant role in performance calculations, safety margins, and compliance with regulations. This highlights the importance of using the proper altimeter setting throughout all phases of flight.