Original Message

KUDOS to you for being adult enough to admit you don't know what you don't know.  A refreshing experience on this forum.

Those who have no idea should check out Honeywell's or Universal Avionic's FMSs (Flight Management System) online.  There is a ton of information and videos to explain how these things work.

Bottom line, if the approach wasn't "armed" or "activated," which obviously didn't happen if the pilot wasn't able in control of the system, they will do just exactly what the previous poster said.