Plain English Meaning

A type of vertical speed indicator that shows how fast you are climbing or descending right away, instead of taking several seconds to catch up like older versions.

Full Definition

Vertical Speed Indicators that incorporate accelerometer-driven pumps to sense vertical acceleration at the moment a climb or descent begins, eliminating the 6-to-9-second lag found in conventional VSIs and displaying the rate of climb or descent almost immediately.

Context Anchor

Seen on instrument displays and VSI tapes when learning to hold straight-and-level flight, climb, descend, or level off smoothly.