It seems on my F700 that I can only effect a change to the warnings when a route exists. Is that others' experiences?

 

This morning I was listening to a podcast on USB that I had to turn up pretty loud to hear well. When I went over the speed limit my eardrums were nearly ruptured by the warning. I tried changing the warning settings to 125% from 100%, but they kept coming at 100%. I tried turning warnings off, but they kept coming. It wasn't until I added a route, had my ears blasted again, and then deleted the route that the changes to warning settings took place.