Altimeters
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An altimeter is an instrument used to measure altitude. On a high powered rocket, an altimeter is typically electronic and uses a combination of accelerometers and barometers to determine altitude. Altimeters on high powered rockets also generally can measure velocity using inertial navigation. The altimeter is programmed to perform specific tasks (such as deploy a parachute) at various altitude an velocities. SSI uses a verity of altimeters.