Mac users interested in Smartnavi 1.6 generally download:
This version of SmartNAVI requires NS4600 SR1.1 firmware (V02.01.0000.12) or DS4600 SR1 firmware (v2.05). Please note that SmartNAVI 2.0 DOES NOT support NS4300N and NS2300N and former models.
See NS4600/DS4600 Release Notes for more detail.
SmartNAVI for Mac OS X 10.4, 10.5 and 10.6.