How to get real-time data and know what the data variable name is...?

Currently SITL with MAVProxy and X-plane. I want to be able to know what the values of calculated data within ArduPlane so I can figure out what is going on.

I have seen documentation on the graphing module but I don’t know how and where to look up the data variable name.

Hints and tips please?

Take a look at the "mavlink messages documentation"
And make sure that you activate the correct SR1_* data streams.
For copter there is a tool that helps you determine what streams you want to activate and help you determine their maximum data rate.

ta for the tip! I’ll check that out on the morrow. time for bed!