One drawback to installing the ESG was brought up to me by my A/P. My Cherokee is IFR, but without any GPS so, as the VORs slowly go NA in my area, at some point I'll need to add one and it looks like the Garmin GPS 175 is about the cheapest way to do that, short of used gear. Given installation costs, the savings of used gear don't really make a lot of sense at least to me.. I could be wrong. Anyway, the ESG requires the installation of the included GPS antenna. Can that antenna's signal also, in the future, feed the Garmin 175, or will I have to find another place on the roof to mount yet ANOTHER antenna? Or.... does the ESG have the ability, like the ES, to use the GPS data from the 175, thereby allowing me to use the existing ESG GPS antenna for the 175? My A/P mentioned the redundancy of having a WAAS GPS in the ESG, but then eventually having to get another one for IFR, and suggested that maybe it'd be best to just go with the GNX375 now and be done with it. Would have been nice, but it's WAY out of my price range right now. Thoughts? The ESG is going in on Thursday, so that's kind of a done deal at this point.