Howdy! Holger,   
   On the ARRL Grid Squares page   
   http://www.arrl.org/grid-squares   
      
   I found several links on their page that was of interest to Me   
      
   The first link is to a Program   
   http://w1ghz.org/new/bd_2004.zip   
      
   Here is the second link   
   http://www.levinecentral.com/ham/grid_square.php   
   I removed the grid_square.php in the Address and found   
   a link to His Ham page at:   
   http://www.levinecentral.com/ham/index.html   
   You may want to look at the other links on His page   
      
   Here is the third link   
   http://stevemorse.org/jcal/latlon.php   
   He also has other links   
      
   The fourth link is to a AMSAT page    
   http://www.amsat.org/amsat-new/tools/grids.php   
      
   I really liked the seventh link to the Summits on the Air page   
   http://www.sotamaps.org/   
      
   On the SOTA page   
   Click the Map Grid Options button at top center of page   
   Then check the Display Grid check box and select one of the two options   
   Locator Grid   
      or   
   Latitude/Longitude Grid   
      
   There is another button for displaying if the area is in Daylight or Darkness   
      
   That page has it ALL!   
      
   Hope these links are of interest to You.   
      
   73 de Ed W9ODR .    .   
      
   ... As I said before... I never repeat myself.   
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