Plain English Meaning

A leg in a published procedure that says 'fly this heading until somebody tells you to stop or you decide to move on.' There is no fixed end point built into it — the pilot ends the leg when ATC issues a clearance or the next instruction is needed.

Full Definition

An ARINC 424 path terminator (coded VM) defining a flight leg that begins at the end of the previous leg and continues on a specified heading until the pilot manually terminates it, typically by selecting the next leg or being given a vector by ATC. The leg has no defined endpoint in the navigation database; termination is by pilot action rather than by distance, altitude, fix, or intercept.

Context Anchor

Seen in instrument procedure coding, especially where a procedure expects radar vectors or further instructions after a published heading.