David brought the deadly machine in fast and low, his mach meter recording a speed that was barely subsonic.

In subsonic flow the Mach meter can be calibrated according to:

The airspeed gauge slowly eased upward, the Mach meter hovering very close to 1.0, the speed of sound.

The captain announced that they would be landing in twenty minutes and the MACH meter dropped to 0.89 again.

Airspeed indication is provided by a single pointer, dual scale airspeed/ mach meter.

He came down with his mach meter indicating twice the speed of sound, and he levelled across David's tail, cutting obliquely across his track under the nose of the oncoming Serpent.

Ann watched the mach meter on her main instrument panel while at the same time checking her number-one cathode ray tube computer monitor and panel C2, the computer control panel and manual main engine controls.

He faced the problem of a complete loss of elevator effectiveness which Yeager experienced during his eighth powered flight as his Mach meter indicated a speed of Mach 0.94 (his true airspeed was in the range of 0.96-0.99 Mach, just below the speed of sound).