Definition
A ground-based visual marker at an airport, consisting of a circular pattern of segments laid flat on the ground near the wind indicator, used to show the traffic pattern direction (left or right turns) for each runway when the airport has no operating control tower.
Plain English
A painted or constructed ring of shapes on the ground next to the windsock that tells pilots which way to turn when flying the traffic pattern at an uncontrolled airport.
Context Anchor
Seen in instrument flying discussions of the flux gate compass system, especially when explaining how a remote compass senses magnetic heading.
Derivation
From 'segmented' (made of separate pieces) and 'ring' (circle). The ring is built from individual segments — extensions or 'L'-shaped indicators — that point out the direction of turns for each runway, hence the name.
Why Pilots Care
When approaching a non-towered airport, the segmented ring tells the pilot whether to fly a standard left-hand pattern or a non-standard right-hand pattern for the runway in use. Flying the wrong direction puts the aircraft head-on with traffic flying the correct pattern.
Analogy
Think of it like a hidden sensing wheel inside the compass system. The wheel itself does not point like a needle; instead, the system reads changes around it and turns those changes into a heading indication.
Intuition Check
Do not picture the segmented ring as the compass display the pilot reads. In this context, it is an internal sensing part inside the compass system.
Example Sentence 1
Before joining the pattern, the pilot circled above the airport and checked the segmented ring to confirm right traffic was in use for runway 27.
Example Sentence 2
During preflight checks the technician verified that the segmented ring inside the flux valve was properly aligned.