[USA] Report on the Results of the CDCR Two-Piece GPS System Field Test / UCI Center for Evidence-Based Corrections, 2007
PDF - http://digbig.com/4wdsj
Jesse Jannetta, Randy Myers, Lori Sexton, Sarah Smith and Alyssa Whitby
"The field test was designed to answer the question: How does a two-piece GPS system perform relative to a one-piece GPS system?"