Projections
Coordinate Conversion
Latitude and Longitude to UTM
Determining magnetic declination
http://geomag.usgs.gov/intro.php gsc.nrcan.gc.ca/geomag/apps/mdcal_e.php
http://geomag.usgs.gov/intro.php
gsc.nrcan.gc.ca/geomag/apps/mdcal_e.php