A GPS strength I value is it's assistance choosing a lane on a high speed road in a city. Sometimes within 1/4 mile there are 4 choices left and right, the traffic is running ~65 MPH, the 6 lanes feel like 600 lanes, and if you're like me you aren't used to people zooming all over the place. Trust the magic voice for lane selection and get thru it!
Repeating what has been said here before but perhaps a little differently, you are in charge, not the disjointed voice. The instructions must make sense to you.