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Magnetic dip causes the compass to dip upward or downward depending on the latitude. Illustration of magnetic dip from Norman's book, The Newe Attractive. Magnetic dip, dip angle, or magnetic inclination is the angle made with the horizontal by Earth's magnetic field lines. This angle varies at different points on Earth's surface.
On the topographic maps of the U.S. Geological Survey (USGS), for example, a diagram shows the relationship between magnetic north in the area concerned (with an arrow marked "MN") and true north (a vertical line with a five-pointed star at its top), with a label near the angle between the MN arrow and the vertical line, stating the size of the ...
Better drawing with bigger and legible translatable fonts. 02:17, 8 June 2012: 644 × 266 (27 KB) Chymæra: font issues: 01:58, 8 June 2012: 644 × 266 (29 KB) Chymæra {{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|The graphic serves to represent the analogy of the XYZ and the more commonly used DIS coordinate systems.
The following other wikis use this file: Usage on ast.wikipedia.org Campu magnéticu terrestre; Usage on de.wikipedia.org Erdmagnetfeld; Usage on es.wikipedia.org
English: A guide to some common symbols found on geologic maps. Includes strike and dip, vertical strata, horizontal strata, anticline axis, syncline axis, plunging anticline axis, plunging syncline axis, and strike-slip fault.
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In surveying, bearings can be referenced to true north, magnetic north, grid north (the Y axis of a map projection), or a previous map, which is often a historical magnetic north. [ citation needed ] If navigating by gyrocompass , the reference direction is true north , in which case the terms true bearing and geodetic bearing are used.
Magnetic declination map at sea-level for the year 2010 derived from WMM2010. The World Magnetic Model ( WMM ) is a large spatial-scale representation of the Earth's magnetic field. It was developed jointly by the US National Geophysical Data Center and the British Geological Survey .