Hi, Bruce

Fixed@cave is a nonexistent station (nor defined nor fixed). Therion is right with warning but it is exactly what I need. I'm try to define station in upper namespace for link to it from other places. It is worked proper but throw a warning...

After the experiments I found a workaround. This code removes warning but it a bit verbose and not obvious...

So, to clarify my understanding of your example.
Fixed@cave = is for example a gps coordinate, defined elsewhere with a fix statement.
Fixed@some.path.at.cave = is a survey station that is defined in a survey, for that same location.
Fixed@other.path.at.cave = is another survey station that is defined in, perhaps, some other survey.
All three stations represent exactly the same physical location.

-- 
  WBR, Vasily