golfyankeesierra
"(747-400 and later) have some kind of built-in decoder so you actually don't have to listen to the ident but it's just on your displays" .....
Hmmmm
Hope you're not current 47-400 operating!! Yes, the 400 CAN give you a visual display of ident decodes - BUT, and it's a big BUT, relying on the auto decode may not be the ideal route to a long life!!
Boeing's manuals used to carry a pertinent caveat as to the possible unreliability of the auto decode and, as used to be standard advice - NEVER assume, CHECK
