Alerts and Navigation Checkboxes
I would love the option to turn off alerts and solely have the navigation voice be audible!
I've read that the purpose for having the options be "Sound Off," "Alerts Only," and "Sound On" -- no "Navigation Only" -- is to keep the interface sleek, which I completely understand and support... so how about instead of making it a slider from "Sound Off" to "Alerts Only" to "Sound On," you made them checkboxes?
That way, you'd only have two toggles -- "Alerts On/Off," and "Navigation On/Off," and folks in dense metropolitan areas wouldn't have to choose between complete silence with no navigation OR navigation while getting their focus interrupted by constant alerts that are mostly meaningless.

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David Johnson commented
Currently the only alert you can disable is the driving directions or everything, add an option to allow us to turn on/off individual types of alerts with a check box. When listening to the radio, its quite annoying that it keeps popping up with every little alert of cars on the shoulder and many other secondary alerts. There are times I want the DIRECTIONS but not every other alert on earth. Split alerts into several categories and allow me to choose. Most times all I want are directions and cops.
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Anonymous commented
It would be useful to turn off pothole alerts and weather alerts when people miss report some of those things often