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Just out of curiosity, I tested this GPS Module with Ceramic Antenna for DIY Handheld Positioning System for $7.86

http://www.dx.com/p/open-smart-gps-...ino-apm2-5-flight-control-480918#.WiDKElWnH4Y because without moving, the Latitude & Longitude numbers go up and down independently. It seems like it is wandering around but stays within a 25 feet diameter circle for the most part. I guess that is pretty good trying to triangulate my location from 3 or more moving objects in space.

That is not good enough for a GPS controlled lawn mower.

I took a few sets of data with a Stationary GPS sampling once per second then plotted the 3 least significant digits in Excel.

http://www.dx.com/p/open-smart-gps-...ino-apm2-5-flight-control-480918#.WiDKElWnH4Y because without moving, the Latitude & Longitude numbers go up and down independently. It seems like it is wandering around but stays within a 25 feet diameter circle for the most part. I guess that is pretty good trying to triangulate my location from 3 or more moving objects in space.

That is not good enough for a GPS controlled lawn mower.

I took a few sets of data with a Stationary GPS sampling once per second then plotted the 3 least significant digits in Excel.