If the Nav doesn't work while driving what good is it? Or is it a programming thing? I'm surprised they don't outlaw those devices that allow you to make it work with all the text and driving issues.
I'll tell you I am guilty of it occasionally but not anymore. A young girl with a child (not with her in the car at the time) was on her phone on the INTERNET rear ended a guy on his motorcycle unfortunately he died. Thee girl had a clean record and she was given a 2 year stint in prison! Plus other punishment. Something to ponder when you drive distracted.