Surveying, Mapping and GIS

Exploring all aspects of mapping and geography, from field data collection, to mapping and analysis, to integration, applications development and enterprise architecture...

  • Geospatial Technology, End to End...

    Exploring all aspects of mapping and geography, from field data collection, to mapping and analysis, to integration, applications development, enterprise architecture and policy

Magnetic Declination

Posted by Dave Smith On 12/01/2008 05:14:00 PM 1 comments


For folks working with historic deeds and bearing references, there are a number of tools available -



Additionally, there is a freeware tool available from Resurgent Software, which will compute historic declinations to 1600: http://www.resurgentsoftware.com/geomag.html

Further online tools and resources for geomagnetism and computation:

EDIT: And an additonal one suggested by Chuck Conley from Canada's Geological Survey

1 Response for the " Magnetic Declination "

  1. Hi,
    when we add two different layers collected during different years in a GIS software, will it create mismatch due to difference in the corresponding magnetic declination/deviation?
    i will be thatnkful if can also send your response to evforester@gmail.com

Search