I sure couldn't parrot what the exclusive Extra sub-bands are
for HF if I was asked.


But as an Extra, you don't *need* to know that, Bill! You just need to


know the


band and mode subband limits..



As above, have you memorized them all?

Well, extras can use any ham frequency. But you still need to know what
modes go in what subbands.




Better to know the person can read
and use the frequency chart because it does change over time.


See above.



We disagreee then on that.



I use a chart when using an unfamiliar band. The concept that you can
operate
whatever mode you happen to hear on whatever frequency doesn't always
work. Like on 80 and 40.