An Audible Altimeter - What Is It?

Put simply it's an electronic device that is normally mounted on or in the helmet of a skydiver which will beep as the skydiver in freefall (or at a high enough descent speed to trigger the audible) passes through a pre-determined altitude.

How Does A Skydivers Audible Actually Work?

The device measures air pressure. It knows when you switch it on that it (or at least it should be) on the ground, and will calibrate itself to ground level - it will normally continue to self-calibrate to the ground level until powered down.

As you ascend in the aircraft, the device registers that you are now on the climb to altitude - and will

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