"Neil Gould" wrote in message
et...

I think the issue is with your use of the term "indicates altitude", which
should be "senses pressure".


It's not an issue with me. Altimeters indicate altitude by sensing
pressure.



The altimeter "indicates" via the display
(dial or digital), and the display is adjustable both during
installation/calibration and by the pilot to adjust for atmospheric
pressure. Consider that when you tell a pilot that the "altimeter is
30.12", the pilot adjusts the _indicated altitude_ by setting the Kollsman
window to that _pressure setting_.


When you tell a pilot "altimeter 3012" the pilot simply adjusts the Kollsman
setting to 3012.



We don't watch the Kollsman (the only
"indication" of "altitude" consistent with the controller's information)
when trying to land. ;-)


Correct.