Came across this one while searching for crappy r/w WX in the sim. RVR was 1800 and so were the minimums, so it was perfect. Launch from KCVO on the CVO4 SID, straight into the ILS 16R, missed, vectors for the RNAV Y 16R. I pull up the RNAV plate and start briefing the notes. I see two new things I'd never seen before...figured I'd share: Thing #1: LNAV minima N/A is simultaneous approaches are in use (thx rwy 16L!). I check the ATIS (was flying in a simulated ATC environment which included a very realistic ATIS) and sure enough, simultaneous approaches are in use. So, thank goodness for WAAS. Thing #2: "Use of FD or AP providing RNAV track guidance required during simultaneous operations." Holy cow, THAT is new to me. I know it's a thing for RNP approaches,which I've dabbled with for fun in the sim, but to see this on a RNAV (GPS), that was eye-opening. It does make sense with simultaneous approaches, I just hadn't seen it before. Are these common at airports with parallel rwys or is EUG just kinda special? As much as I'm excited to have WAAS in my airplane at last, I don't have a FD and would've been forced to rely on the AP to fly the lateral portion of the approach, which I don't trust as far as I could throw it. Followup question...why is the same #2requirement NOT included on the ILS?