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As far as I can see, two seperate, unrelated technolgies. DGPS polls 2 recievers and votes the difference and WAAS has shore based recievers that track the minor time drifts (or differences - not sure 100%) of the satelites -vs- what you pick up on your GPS unit... Would running all 3 get you down to less than 3 meters probably, but short of military apps (and they have their own seperate systems) what would need that accuracy less than 3 meters (and would we want others too - hehehehe)
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