Most of these are bug fixes, and some BIM360 Glue integration performance improvements. Details and direct links below:
Autodesk Navisworks 2016 Service pack 2 delivers user experience and stability improvements to the Autodesk BIM 360 integration. Service pack 2 also addresses problems identified in other parts of Autodesk Navisworks 2016. Service Pack 2 also includes all of the updates from Service Pack 1. Service Pack 2 can be installed on either the original version or the Service Pack 1 version of Autodesk Navisworks 2016.
Autodesk_Navisworks_2016_Service_Pack_2_Multilingual_Freedom_64bit.msp (msp – 78Mb)
Autodesk_Navisworks_2016_Service_Pack_2_Multilingual_Manage_64bit.msp (msp – 101Mb)
Autodesk_Navisworks_2016_Service_Pack_2_Multilingual_Simulate_64bit.msp (msp – 101Mb)
Autodesk Navisworks 2016 Service Pack 2 Feature readme.pdf (pdf – 422Kb)
Autodesk Navisworks 2016 Service Pack 2 Installation readme.pdf (pdf – 308Kb)