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You're using ground-based assistance to get that extra accuracy. This upgrade gives the satellite signal better accuracy without the need for ground based assistance stations (and expensive receivers).

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I know, that's the point of DGPS. What I meant was, we already have that infrastructure and accuracy, so why are they putting new satellites? I guess the ones up there are getting quite old now.

So you can achieve the better accuracy without the expensive DGPS equipment and subscriptions to the DGPS services?

DGPS requires a fixed base in order to calculation the differentials I believe.

Some states, like Iowa (http://www.iowadot.gov/rtn/), also have real time information you can access to reduce the margin of error.

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