I would agree with Mike here. In the post SA world short term averaging does not greatly increase the accuracy of you marked waypoint. I still use it though. I use to so I can get away from my GPS and let it have a better view of the sky. Of all the obstacle around a GPS the biggest and closest is your own body. Since I do not have a remote antenna I set the GPS to average a point and set it down on the point I want to mark and walk a short distance away so I am not casting a "shadow". If I can I will try to set it up onto something. When marking my father's farm I put in on the tops of the fence posts that were at the corners of the farm. Now the GPS was able to get all possible satellites without me blocking any. I give the GPS a few minutes to find any blocked satellites and to average. This is not away feasible though. Out in the woods your GPS would be fine, but I would not feel comfortable doing this in a public place your GPS might grow legs. Just an idea. It works well sometimes.