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i think your right about that.  i was at a eaa chapter meeting last month.  one of the guys from garmin came and did a presentation on the 430 and 530.  if i remember right he said that gps is already more accurate means of finding your altitude.  i believe he said they usaully say it will be accurate to +-1 foot. it is good enough to do gps only appoarches (don't let the faa know if you do one). ils may be a thing of the past in the next 10-15years as well.  btw when are the vors going out?  last i heard was in 2008.