Can anyone recommend simple, and preferably free, software to calculate geographic distance between sets of latitude and longitude coordinates? Alan Prather 166 Plant Biology, Wilson Road Botany & Plant Pathology Michigan State University East Lansing, MI 48824-1312 (517) 355-4695 fax (517) 353-1926 alan at msu.edu http://www.bpp.msu.edu/herbarium/prather.html