chapter  15
Altitude Measurement
Pages 16

Altitude can be determined via barometric altimeters or it can be measured via electronic radio wave systems. œe indication of the Ÿrst equipment is referred to as pressure altitude, or simply altitude, whereas that of the second category is referred to as geometric height or simply height or true altitude. Pressure altitude is derived onboard, whereas the height can be derived either onboard or in ground stations.