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RE: Which way is up? (North arrows)

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The architects I've worked with have most used a convention using two arrows
crossing each other.  The actual north line is labeled with a large graphic
N.  The second arrow is aligned with the main building layout closest to
north.  This arrow is labeled "Called North".  It is a simple convention and
works well as long as all members of the team use it.
Bill Cain SE
Oakland CA

	-----Original Message-----
	From:	Sherman, William [SMTP:ShermanWC(--nospam--at)]
	Sent:	Monday, December 11, 2000 10:35 AM
	To:	SeaInt Listserver (E-mail)
	Subject:	Which way is up? (North arrows)

	I'm curious as to whether there is any "consensus" in how to handle
	arrows when north is shown other than "up" on a plan sheet. For
example for
	a long rectangular structure, it is often more convenient to draw
	structure with the north arrow shown either to the right or to the
left - is
	there a preferred direction? On some projects, the structure is
skewed up to
	45 degrees rather than orthogonal to north - how do you handle
	"north" for such structures? Occasionally I have seen drawings with
	north arrow shown "down" on a plan sheet - what basis would there be
to show
	north down? (It seems contrary to intuition since most maps are
drawn with
	north "up".) 

	Also, has anyone encountered problems on projects where different
sheets for
	the same structure show north oriented differently? (e.g.,
mechanical sheets
	with north to left and structural sheets with north to right -
problems such
	as mechanical or structural elements field located in the wrong
place due to
	confusion in direction.) 

	William C. Sherman
	Camp Dresser & McKee, Inc.
	Denver, CO
	Phone: 303-298-1311
	Fax: 303-293-8236
	email: shermanwc(--nospam--at)