Definition
An operating mode of an automatic direction finder (ADF) receiver in which the receiver automatically tunes through a preset list of stored station frequencies in succession, allowing the pilot to monitor or use several non-directional beacons (NDBs) without manually retuning each one.
Plain English
A setting on the radio that makes it step through a saved list of stations one after another on its own, instead of the pilot turning a dial to change to each one by hand.
Context Anchor
Seen when using a GPS or panel navigator to follow a flight plan, especially during routes and instrument approaches where the unit may either advance automatically or be held on one point.
Derivation
From 'sequence,' meaning a set order of items. The receiver works through the stored frequencies in sequence, so the mode that does this is called sequencing mode.
Why Pilots Care
It reduces pilot workload by updating navigation guidance without requiring manual intervention at each waypoint.
Intuition Check
Sequencing Mode does not mean air traffic control is putting aircraft in order for landing. Here, it means the navigation unit is automatically moving through the planned points in your route.
Example Sentence 1
With three NDB frequencies stored, the pilot selected sequencing mode and let the ADF step through them while flying the route.
Example Sentence 2
Suspending sequencing mode allowed us to hold at the current waypoint until cleared for the approach.