NavList:

Marco, just to emphasize, it is relatively easy to modify your algorithm to generate points in such a manner that they are evenly-distibuted over the globe --evenly-distributed in the sense that the probability per square mile is the same at all latitudes and longitudes. There are a number of ways to do this. I'll repeat my standard approach here since it's short and simple:

Generate a pair of random numbers (x,y) in the range from -90 to +90. If x>90·cos(y), reject the point.
Then y is interpreted as latitude and x is converted to longitude:
   Lat = y,
   Lon = 2·x/cos(y).

That's all there is to it (assuming I set it up correctly!). Now you have random points with no preference for one geographic region over another. 

Frank Reed