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You could always use one of the freebie utilities to save a log of raw NMEA data, the use Excel to do the averaging. Also, VisualGPSce (google for it) will do fix averaging, with SD calculations, for you dynamically. But remember, the accuracy of the fix will still be 3-5M with WAAS, tops, unless you invest in something like the Trimble systems that have more accurate clocking to get really accurate fixes.
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