I believe both the CMP03 and the Vector 2x mentioned in my previous post 
have provisions in their firmware to allow user to do soft iron calibration 
to handle the problem of near-by iron objects. I suggest RTFM for each. 
These devices have be successfully used to assist robots in navigating. I 
strongly suggest googling to see some of the applications that have/are 
being done with them.

HTH

Vic
________________________________________________________

Victor Fraenckel - The Windman
victorf ATSIGN windreader DOTcom
KC2GUI

      Home of the WindReader Electronic Theodolite
                               Read the WIND

"Dost thou not know, my son, with how little wisdom the world is governed?"
-Count Oxenstierna (ca 1620) to the young King Gustavus Adolphus

"People sleep peacefully in their beds at night only because rough
men stand ready to do violence on their behalf."
-George Orwell

"When a true genius appears in the world you may know him by this sign: that
all the dunces are in confederacy against him."   -Jonathan Swift 


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist