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.