Accurate USB GPS Unit

Accurate USB GPS Unit This afternoon I tested an AmbiCom USB GPS and the cordinates were jumping all over. Most of them were at least 30 feet off. Anyone have any experience with any other brands/have any recommendations for a more accurate USB GPS unit?
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Guest [Entry]

"Accuracy of GPS depends on many factors:

the consumer accuracy (15 to 30 ft approx.), due to jam in consumer signals (the military accuracy is far better)
the number of satellites in view (3 is the bare minimum)
the environment (near building or structure, reflection and refraction of materials)

So don't expect a better accuracy."