To ensure your models are aligned I highly suggest seeing the BYU tutorial. http://cmfac.groups.et.byu.net/miller/cm411/help/n
please check out some of the tutorials that I compiled.
Quick start tutorial on Navisworks http://bit.ly/wjv8ZQ
Clash Detective http://bit.ly/wsXkHG
Navisworks Tutorials - 4D Timeliner http://bit.ly/GGvhhM
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