I saw this link in the Texas Cavers mailing list by David Locklear:
http://tinyurl.com/o552nnz
I wonder what hardware and software he uses...but searching online, I
found these 4 articles:
http://tinyurl.com/pqcxf2k
http://tinyurl.com/p366b4d
http://tinyurl.com/oav9ges
http://tinyurl.com/oj7j9z4
Lee Skinner
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