There was some discussion a while ago about the geomagnetic "K Index" and GPS positioning error. A mention was made that we probably wouldn't notice much until a "K7" or greater geomagnetic storm was in progress. To see if there is a correlation, a K7 storm is now underway (yesterday was a 6), this is a chance to go beyond just arguments as to wether it can affect our birds, to a experiment to see if it actually does at this level.