Altimeter setting is the value to which barometric pressure scale of the altimeter is set so the altimeter indicates

• A. True altitude at field elevation
• B. Indicated altitude
• C. Pressure altitude
• D. Altitude above mean sea level

Answer: (A)

Setting the altimeter to the local pressure value (QNH) calibrates the barometric scale so the instrument shows height above mean sea level. When you’re on the field, that height above sea level is the field’s elevation, so the altimeter reads the true altitude corresponding to the field’s elevation. In other words, the setting makes the altimeter indicate the field’s true altitude above mean sea level.