Many operators forget that the SL-30 can provide a VOR cross-fix simultaneously with providing the localizer signal. e.g., if there is a VOR cross-fix for the FAF or a step down fix, the SL-30 will give you the radial you're on. I don't know how or if this displays on a SkyView; on a GRT, the HSI main needle shows the localizer, and a bearing pointer on the HSI shows the cross-fix VOR. The SL-30 itself will also show this info.
As previously noted, WAAS has nothing to do with an ILS. It's a correction signal for GPS.