GPS for NDB IAF on ILS?

I don't have my AIM here at work, and I'm on dial up, so I won't attempt to
download it, but I'm looking at the ILS 32 into KMQY Smyrna TN. It says ADF
REQUIRED which I understand is to identify the IAF which is the SWZ NDB not
associated with a marker beacon, inside the outer marker. This is the only
IAF charted, it is also the missed approach holding location.

My question is: In this situation is it legal to use a IFR Term Certified
GPS to substitute for an ADF.

Thanks
Jim