Some people even call them trails of mouse terds. <img src="/forums/images/graemlins/shiner.gif" alt="" /> <img src="/forums/images/graemlins/ignore.gif" alt="" /> Yes, they can be very valuable, especially when the Chuck Wells waypoints are 10 years old, which is before selective availability was turned off, so the accuracy on some waypoints in the 1st edition book is fairly poor. It's not uncommon to see good signal strength to multiple satellites, have an estimated proximity error of <15 feet, but be at least a few hundred feet from Chuck's waypoints at junctions.