The magnetic declination in a given area will change slowly over time, possibly as much as 2-2.5 degrees every hundred years or so, depending upon how far from the magnetic poles it is. This may be insignificant to most travellers, but can be important if using magnetic bearings from old charts or metes (directions) in old deeds for locating places with any precision.
go to the road scholar wiki. i found it very helpful. http://scioly.org/wiki/Road_ScholarSome one plz helpp
finding magnetic declination over time
azimuths and bearings
drawing a map using their instructions
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