ATPL: Indication of Mach number is obtained from:
Domanda 11, Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license
| An ordinary airspeed indicator scaled for Mach numbers instead of knots |
| A kind of echo sound comparing velocity of sound with indicated speed |
| Indicated speed and altitude using a speed indicator equipped with an altimeter type aneroid |
| Indicated speed (IAS) compared with true air speed (TAS) from the air data computer |
