When to acknowledge ATC

Steven P. McNicoll wrote:

Altimeter settings don't tend to vary a great deal from one controller to
the next. If you're issued one that differs by more than a few points from
the previous then it's a good idea to check on it.

I rarely get an altimeter setting from a controller anyway. I make a point of
picking up the setting from AWOS stations in flight and from ATIS before arrival
or departure. As long as you tell the controller you have the ATIS, about the
only time they'll give you the setting is as a gentle notice that you don't seem
to be flying at the altitude at which you're supposed to be.

George Patterson
There's plenty of room for all of God's creatures. Right next to the
mashed potatoes.