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
I know that i explained the PLSS somewhere in this thread.PLSS: Here's how you write a location in PLSS: Find the section number, then find where it is in that section. For instance, if there is an orchard in the northwest corner of section 30, then you write NW 1/4 NW 1/4 30 to start. Then, you have to write T # S R # W, which indicates township and range, and can be found in quadrangle margins. So in all a PLSS description could look like: "NW 1/4 NW 1/4 30 T12S R7W" For more information, read the [wiki][/wiki]. You can find stuff about sectors there too.
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