USB GPS Accuracy

USB GPS Accuracy 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]

"That is normal for a GPS receiver. The accuracy will, like davr, already said, depend on the obstacles in all directions, speed of movement, ...

If you need a higher level of accuracy you'll have to go with differential GPS."