Hello AbbevilleBoy
Have you read the synopsis written by Andreas Brekken at
http://www.stormbirds.com/eagles/res...gradnetz.html? There is also a online tool that you can use to convert these map codes to latitude and longitude positions at
www.gyges.dk/LUMA.xls. The guide towards its usage is found at
http://www.gyges.dk/LUMA%20Guide%20v2007%2005.pdf. I hope this helps.
Horrido!
Leo