Surveying
The horizontal angle between the true meridian and magnetic meridian at a place is called

local attraction
azimuth
declination
magnetic bearing

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Surveying
For mapping any country

Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
Geodetic triangulation of greatest possible sides and accuracy is carried out
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
All listed here

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