I ran today’s Foots Cray Meadows DFOK local event with my GPS logger and got an excellent trace – pretty much no dropped signal, due to the open nature of the area and cloud-free skies.
Here’s the trace, overlaid on a Google Earth image. The start/end is on the top-right. Any straight lines are me running in a straight line, rather than the signal dropping.
Update: I’ve posted the image on Flickr here so you can (a) see it in greater detail and (b) see the various notes I have attached to parts of the course.