vCard field name for Custom 4?

[Joshua Richie]

Does anybody know what the correct field name is to put information into 
  the Custom 4 field of Addressbook?  I have an iQue 3600 by Garmin, 
and have found that Custom 4 is what stores the GPS Location 
information, and so I am using the exchange manager to add a contact to 
the addressbook with location information, but I don't seem to be 
getting the right name for Custom 4.  Any Ideas would be appreciated.
Thanks,
Joshua Richie

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