QNH is used to indicate which altitude reference?

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Multiple Choice

QNH is used to indicate which altitude reference?

Explanation:
QNH is the local sea-level pressure setting. When you dial in QNH, the altimeter is calibrated so its reading corresponds to height above mean sea level. In other words, the altitude shown becomes the true altitude. If you used the standard setting (QNE), you’d be reading pressure altitude, and with QFE you’d be reading height above the airfield. Keep in mind that true altitude is the height above mean sea level, while the indicated altitude on the dial is what the instrument shows, which can differ from true altitude in nonstandard temperatures.

QNH is the local sea-level pressure setting. When you dial in QNH, the altimeter is calibrated so its reading corresponds to height above mean sea level. In other words, the altitude shown becomes the true altitude. If you used the standard setting (QNE), you’d be reading pressure altitude, and with QFE you’d be reading height above the airfield. Keep in mind that true altitude is the height above mean sea level, while the indicated altitude on the dial is what the instrument shows, which can differ from true altitude in nonstandard temperatures.

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