I see what you mean.
With respect to the lines crossing, since these lines are on a spherical surface, they will cross at two points so if you don't find anything at the near intersection, you are in for quite a trip to get to the other. That's where a GPS would come in handy.
Then again, blaming the lack of finds at the intersection of the proximal signal lines by saying the target must be at the distal crossing is a good excuse and corroborates the outstanding range of these instruments.
