Definition
In instrument flying, 'tags up' describes the moment when an instrument indicator (such as a needle, pointer, or marker) reaches and aligns with a reference mark, target value, or another indicator on the instrument face, signaling that a desired condition has been met.
Plain English
When a needle or pointer on an instrument moves up to meet a specific mark or another needle, lining up with it exactly.
Context Anchor
Seen in instrument control discussions, especially when checking that instruments such as the altimeter or vertical speed indicator have responded after a pitch or power change.
Derivation
From the everyday sense of 'tag,' meaning to touch or make contact with something. The phrase pictures one indicator moving up until it touches or meets the target mark.
Why Pilots Care
Ensures the airplane remains stable and on the desired flight path without introducing new errors during attitude changes.
Intuition Check
Tags up does not mean putting a label on something. Here it means a delayed instrument indication has caught up enough to be trusted.
Example Sentence 1
As the airspeed needle tags up with the climb speed mark, smoothly raise the nose to begin the climb.
Example Sentence 2
With tags up complete, the scan returned to the attitude indicator to confirm level flight.