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In Reply to: 540i Nav system posted by Norm on January 29, 2000 at 11:38:16:
I do not have NAV, but do like selecting most functions without leaving the steering wheel. The most common change is a radio station or CD track which is easy from the wheel buttons. (Also, I believe you have less radio pre-sets with the NAV option).
I would not buy the NAV for the non-NAV funtions which are not used that often (after som initial playing and setting). However, if you travel in unfamiliar locations that is different.