I only included waypoints of three or more marks at one location to eliminate those where a 12XL and a Venture were used at the same time.  These numbers might be slightly better than actually occurred because I occasionally delete or modify numbers that are clearly bad in the interest of getting the best location value.  However I also keep some "bad" numbers so a user can get an idea of how far off the GPSR can be.  That having been said...  I don't remember any marks that were really worse than indicated here and the percentage of waypoints I deleted or modified is very small - probably not enough to change the numbers.

One bad mark I remember was done on top of a ridge at 14,000 feet.  There was a great view of the sky with plenty of satellites.  The Venture placed my waypoint mark 30 meters away from the trackpoints it recorded (it recorded three trackpoints where I stopped to mark the waypoints).  The track recorded by the 12XL matched the track recorded by the Venture and the waypoint recorded by the 12XL was where I expected it to be.  I think the Venture needs some smarter firmware (better filtering) to prevent recording a waypoint that is clearly wrong.  This is the only time I have gotten an error this drastic with a good satellite constellation.

An anomaly: On one occasion I saw the 12XL move in one jump about a 1/4 mile away while I was standing still.  After a few minutes "it returned" to my current location.  No marks were made at that time.

Note: The spread is the max. value minus the min. value for the point.