Instructions for use:
(the following assumes you are using a PC with NASA Worldwind and 
winzip installed)

1. Download the zip file to your local machine
2. Using Winzip, extract the contents of the zip file to the folder 
containing your Worldwind installation – for example “C:\Program Files\NASA\World Wind 1.4”. 
3. Open Worldwind, and in the upper toolbar select “File ==> WDMAM”

You should now be able to navigate around the earth, and explore the 
WDMAM data compilation. 

Notes:
The images of the WDMAM magnetic data are histogram equalised. These images 
are terrain-mapped on to a surface with a linear vertical scale, thereby 
preserving the actual anomaly shapes and illustrating the huge relative 
amplitudes of certain magnetic anomalies such as those in eastern and 
northern Russia. The best vertical exaggeration will vary between different 
areas of the data, the exaggeration can be easily altered using the number 
keys.