GPS Data Collection - First Run

This is a GIS plot of around 9216 stationary GPS readings.  The full average was some 14m from the actual GPS position.  By just averaging GPS readings with a HDOP of less than 1.24, the average moves a bit, but not much. 

Just as a comparison, I set my iPhone 4 on the same West facing window sill and took a GPS reading (using the LogGPS App), when the error rate had dropped to +/- 5m.  I have plotted the result out in the empty block.  It too was around 14m away. 

As another test, I placed my iPhone outside on the fence top and took another reading when the LogGSP error was down to +/-5m and found that the plotted reading was just 3m off.