I geocache - almost daily, currently approaching a milestone 1000 finds.
Answer to the Q: GPS satelitte navigation is based on accuracy. The satelittes "fix" your point and then recalculate the point. The variance of velocity even when standing still is attributable to the satelitte "inaccuracy" in reading your real position.
The real answer to the Q: I also use a set of Garmin's. I have also tested a few other units for the local geocaching community and back home. The solution to "jumping" (as geocachers refer to it" is to stand still anything up to three or four minutes. Once an accurate fix is obtained the accuracy will diminsh. Anything under 15 feet is good, anything under 8 feet in excellant. The smaller the area the satelitte has to work with, the less jumping it will do.
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