Support group for land surveyors who still use HP48 and HP35 Calculators for Data Collection and in their daily surveying lives. Share tips tricks and software here.
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also here is a powerpoint presentation which may help with magnetic declination
http://www.authorstream.com/Presentation/LssPublishing-133011-magne...
http://www.atlasquest.com/tutorials/compass/declination.html
http://mathforum.org/library/drmath/view/60398.html
http://www.hpmuseum.org/features/35f.htm