RE: [Man.Distr]RE: [Man.Distr]Re: Northing

From: <Christopher>
Date: Sat Oct 18 2003 - 11:57:00 EDT

>Now I know that the magnetic north varies and compasses are'nt made that way.
The only way to tell for sure is to find the survey drawings used in construction. The magnetic variation changes slowly but continually so magnetic north will be different depending on when the drawings were made. That's one reason to define the 'called north' as happens to be convenient. There really isn't any reason to use true north to lay out piping or refer to the direction of a run.

Besides, a lot of that is obviated by the use of GPS which will show true north directly and locate objects within a foot or two.

Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=jhzZpaSjwulfOQ7dZzCOVh3PC6tIW4OyhVI8jOJQjwXEWzprD500eo3b9sJCfjR3Q8OQnQsjurOvDM3c">chrisw@skypoint.com</a> | this distance" (last words of Gen.

___________________________| John Sedgwick, Spotsylvania 1864)

<a href="http://www.skypoint.com/~chrisw">http://www.skypoint.com/~chrisw</a> Received on Sat Oct 18 11:57:00 2003