Cave-Surveying digest, Vol 1 #55 - 1 msg

[Garry Petrie]

Glad do see I ported the code correctly - about five years ago.

http://www.resurgentsoftware.com/geomag.html

The program is free, but does not show all dozen parameters of the field
(who cares?).

Garry

> Message: 1
> Date: Thu, 19 Dec 2002 10:42:27 -0700
> From: P A Hill & E V Goodall <goodhill@xmission.com>
> To: Cavers Digest <cavers@caversdigest.com>
> Subject: Why record date on a survey?
> 
> I was recently pointed to the following site, which can be 
> used to find the 
> magnetic declination of any location on Earth since 1900.  
> 
http://www.ngdc.noaa.gov/cgi-bin/seg/gmag/fldsnth1.pl