I'm with the smartphone folks. I use my iPhone, which is near flawless for this purpose. Personally, I turn the volume off and watch the screen. With the newer technology, I don't see stand-alone GPS units surviving much longer. I don't know how the OP's radio situation is configured, but anyone with an iPhone should consider upgrading to an aftermarket head unit with Apple CarPlay. A lot of newer vehicles come with this function built into their factory head unit. This will absolutely improve your driving experience, even if you're someone like me that doesn't listen to the radio very much. To the point of this topic, it will display the navigation on your screen (mirroring of your phone). And since the iPhone is constantly updating its maps and computing traffic scenarios, it's always better than stock navigational systems in cars and stand-alone GPS units that only update when you make the effort to do so.
