So I started studying the G1000 (Nav III) for the Cessna and spent 20 minutes in the simulator trying to figure out how to tune an NDB when I looked it up in the manual:
The G1000 does not support tuning of the ADF in Nav III aircraft. ADF tuning is accomplished through the Bendix/King KR 87 ADF Radio. ADF volume must also be adjusted through the KR 87.
A top of the line system doesn’t even have an ADF/NDB radio built in? WTF.
So you can get ADF info on the PFD, but you have to use and tune an external radio.
Boourns to that.
Some G1000 versions get a fully integrated ADF. Displayed in the PFD, but painfully tuned via the FMS knob… not exactly friendly. Read more on that on my post about this topic: http://www.plasticpilot.net/blog/2007/08/26/g1000-adf-dme-and-dual-ils-display/