tag:blogger.com,1999:blog-12965939.post7164180108597159403..comments2023-10-29T14:29:09.349+00:00Comments on Profundezas...: UnderGround Positioning System – UGPSUnknownnoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-12965939.post-85049550818076247142011-01-21T15:04:52.003+00:002011-01-21T15:04:52.003+00:00if you copy content, please put back a link to the...if you copy content, please put back a link to the original post<br />http://www.karstworlds.com/2011/01/underground-gps-finally-possible.htmlVortexhttps://www.blogger.com/profile/16890655728513134363noreply@blogger.com