The Altimeter
What Is An Altimeter ?
An altimeter is a device for measuring vertical distance above a pre-defined datum.
If this distance is above the ground we refer to it as 'Height'.
If this distance is above sea leve we refer to it as 'Altitude'.
If this distance is above an internationally recognised Air Pressure Level we refer to it as a 'Flight Level'.
Web References
Aerosonic
