This compass is a heavily reworked version of Laranjo's file at http://www.blendswap.com/blends/view/66725
This Blender file is licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License.
The following assets were used in this file.
chart: http://en.wikipedia.org/wiki/File:Pedro_Reinel_1504.jpg (CC-0)
adjusted compass texture: http://pixabay.com/en/gyro-compass-magnetic-metal-large-307228/ (CC-0)
The HDRI environment map was taken from http://www.openfootage.net/?p=1165 (CC BY 4.0)
Note: a nicer render can be made if the environment map is replaced by the Chiricahua NarrowPath map which can be downloaded here: http://www.hdrlabs.com/sibl/archive.html
For a preview with that map check out the second preview image (to render that image set rotation of the texture coordinates node to 0, and reduce the AO a bit).
This is really nicely done. Super simple but extremely well modeled and presented.