To which north do people refer to always?Magnetic or true north? help!?


references "north" true north. case maps, layout of city grids—where precisely oriented true north-south-east-west— surveyors marks, etc. reference magnetic north in relation compass.

markg asserts less 10° of each other. live—portland, oregon—they more 15° different, , places travel (washington's san juan islands) more 21°. there few places in world 40° different.

click on map "magnetic declination" point in world strictly due geographic geometry of magnetic poles , true poles: http://magnetic-declination.com/ might wonder else affect difference: large natural iron deposits, magnetic rocks, large steel buildings , tanks, power stations, , many other things affect local magnetic field. map tool not considering those.



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