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!style="background:#E3E3E3;" | [[h:De:Kompassrose|Deutsch]]
!style="background:#E3E3E3;" | [[h:En:Compass rose|English]]
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== Tool "Compass rose" ==
[[File:Modern nautical compass rose.svg|miniatur|]]

The tool "Compass rose" can be switched on and off via the menu "Ansicht" > "Kompassrose". 
<br> The compass rose appears in the lower right corner of the map.

=== Geodetic/true north ===
The '''outer''' ring of the compass rose shows the '''geodetic direction''' on a true 360° scale. 
<br> The north marking agrees with the direction towards geodetic north on the map.

=== Magnetic north ===
The '''inner''' ring of the compass rose shows the '''magnetic direction''' at the center point of the map; it has a 360° scale as well as a subdivition of the cardinal direction into 32 compass points. 
<br> The north marking agrees with the direction towards the arctic magnetic pole (the magnetic south pole which is located close to the geodetic north pole) on the map.
<br> The inner ring therefore shows the image of a compass in the hand of a user located at the center point of the map facing geodetic north.

=== Magnetic declination ===
The magnetic declination (also called magnetic variation) is the angle between geodetic north and magnetic north with reference to location and time. 
<br> It is shown inside the compass rose in unit degree.

== Application ==

=== Navigation ===
...

see: [[wikipedia:en:Magnetic_declination#Navigation|Navigation]]

=== Bearing ===
...

== Basics ==
=== Earth%27s magnetic field ===
[[wikipedia:en:Earth%27s_magnetic_field|Earth%27s magnetic field]]...

=== Magnetic declination ===
[[File:D map mf 2005 large.jpeg|miniatur|isogone map]] <!-- lesbare Gradzahlen wären besser -->

The magnetic declination varies at different locations.

The main reason for the local variations in the declination angle are irregularities in the earth%27s magnetic field.
<br> Only close to the pole the declination angle aso varies due to the location of the geodetic and magnetic pole.

Locatons of the same magnetic declination can be connected by a line called isogone and be visualized in a isogonemap.
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=== Variations ===
[[File:Earth Magnetic Field Declination from 1590 to 1990.gif|miniatur|variations between 1590 and 1990]]

The magnetic declination varies in time at all locations.
<br> The variation rate is given in degrees per year.
<br> The animated isogone map shows the variations within the last 400 years.
<div style="clear:both> </div>