writes:

Folks, is there an emoticon depicting a shaking head?

You might wish to review the state of simulation before shaking your head.
For some of the instruments I'm using, the accuracy is such that there is no
documentation from the developer of the simulation, because you can just
download the real documentation for the instrument and consult that.

This is very useful to people who need to train themselves in the use of a
specific flight instrument before actually buying and installing it.