Just bought a 182P with a pretty basic IFR setup. Aircraft has two nav/comms (KX-155 / Narco MX-12) with dual G/S, and a working KLN-90A with the IFR paperwork. Transponder is KT-76A w/ Mode C. I'm a new IFR pilot and trying to figure out what the appropriate equipment code is (AIM table 5-1-3). Since it's a non-WAAS GPS, but approved for enroute, assuming that /G is not appropriate? Perhaps RNAV with no GNSS? (/I?) Thanks.