Pilots in 2026 measure a vast array of critical data points to ensure safe flight, primarily focusing on Altitude, Airspeed, and Heading. Altitude is measured using a barometric altimeter, which calculates height above sea level or ground level by sensing atmospheric pressure. Airspeed is measured in "knots" using a pitot-static system, which compares the pressure of moving air against still air. Heading is tracked via a Magnetic Compass and an Inertial Reference System (IRS) to maintain the correct course. Additionally, pilots constantly monitor Engine Performance (such as RPM, oil pressure, and fuel flow) and Vertical Speed (the rate of climb or descent). In the modern 2026 cockpit, they also measure Angle of Attack (AoA) to prevent stalls and OAT (Outside Air Temperature) to calculate true airspeed and check for potential icing conditions, all while maintaining a "situational awareness" of their position relative to the horizon and other aircraft.