No - it says NOT needed for non-precision. i.e. a standard GPS approach here (uk) and in the USA does NOT need WAAS. but the precision approaches with simulated ILS DO require WAAS - we dont have these in the UK yet. I dream of the day when we can and dont need full ATC!. (Too many negatives sorry..
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PS. One of the other benefits of WAAS is that you are very very unlikely to get a RAIM (if ever).