The best is a
true altitude chamber that takes the trainees to altitude by simulating a sudden decompression.
True altitude is similar to absolute altitude, but instead measures our distance above sea level.
Comprised of the aforesaid mound of rock and snow, a video of the team sawing off the peak, along with 22 photographs, archival material, and assorted mountain climbing and cutting gear, Zhen's installation comments on ongoing debates about the
true altitude and position of the world's highest mountain.
If in class A airspace with 29.92 properly set, your
true altitude might be off by a few hundred feet, but assuming you have an accurate local altimeter setting, the altitude that you're reading should be pretty darn accurate, right?
Corrections applied to the Pole Star altitude bring it to the
true altitude of the celestial pole, and thus to the latitude of the observer.
The
true altitude at DA could shrink to a dangerous level.
In addition to the incorrect altimeter setting, it's colder than standard, which results in an indicated altitude higher than
true altitude. With the correct altimeter setting, you would see 1930, but with a 50-foot correction for the temperature, you're actually at 1880.
Pressure altitude is used to compute density altitude,
true altitude, true airspeed (TAS) and other performance data.
True altitude is the actual vertical distance above mean sea level, measured in feet.
Pressure altimeters are calibrated to indicate
true altitude (actual height above sea-level) under standard conditions only, and any deviation from standard conditions produces an error in the indicated altitude.