The Nearby.org.uk site has a pair of replacement compass indicators for Google Earth:
The Compass Star replaces the standard Google Earth compass indicator:
with one that has an angular degree scale, and finer divisions:
The Magnetic Compass is supposed to do something similar, but this time displaying the direction of magnetic north at any location:
… but sometimes it doesn’t seem to work right.
NOAA has a website that will give you the magnetic declination (the deviation between true and magnetic north) for the present, or any date after 1900, for the entire world. For the US, there’s also a page that gives you that value for dates before 1900. Links to graphic maps of declination and other info are available here.
Related posts:
- Cartographic Utilities In MicroDEM: Datum Shift, Magnetic Declination, UTM Grid Deviation From True North, And Sunrise/Sunset/Twilight Times
- Learn/Plan Compass Use In A Google Maps Interface
- Importing Google Earth Imagery Into A GIS
- World Digital Magnetic Anomaly Map (WDMAM) Released
- LIDAR Data Coastal Erosion And Flooding Analysis Using MicroDEM
- Online Lat/Long – UTM – Grid Coordinate Converter
- Using GIF/PNG Transparency In Displaying Raster Graphics In Google Earth
- Drawing Lines Between Points In Google Maps, Straight And Great Circle
- Creating Google Earth Screen Overlays With EarthPaint
- Adding Vector Graphic Objects To Google Earth
