Magnetic Variation

[Robert Brown]

Friends in Radio Land,

I have agonized enough, watching this discussion about magnetic variation.
The information needed can be found on a map from the Defense Mapping 
Agency (they have a 800-number).  In fact, they have a full set of 
geomagnetic maps for those interested.  But for magnetic variation, ask 
for DMA Stock No. WOBZC42.  I don't recall the price but if you're 
serious, it is not unreasonable.

For some typical values, consider the following for the compass variation:

		Seattle 	22 degs E of North
		Bismarck. ND    10 degs E of North
		Chicago, IL      1 deg  W of North
		Detroit, MI      6 degs W of North
		Buffalo, NY     10 degs W of North
		New York City   15 degs W of North
		Los Angeles     14 degs E of North 
		El Paso, TX     10 degs E of North
		New Orleans      3 degs E of North
		Charleston       5 degs W of North
		Wash, D.C.      10 degs W of North

That ought to get you oriented.  Now the next question is the width of 
your antenna pattern.

73,

Bob, NM7M

--
FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 K7LXC@contesting.com
Sponsored by Akorn Access, Inc & KM9P