1. Eliminate chattiness. I've had the Google navigation system talk for 30 seconds straight as I'm trying to figure out which lane to be in, so that it can reci

1. Eliminate chattiness. I've had the Google navigation system talk for 30 seconds straight as I'm trying to figure out which lane to be in, so that it can recite every single word on a sign i passed. 2. Say which way I'll be turning later on so that I'm not stuck waiting for the last minute turn left, crossing 3 Lanes of traffic. 3. Only the essentials on the screen, with more important stuff bigger. Don't keep everything proportional if it makes it harder for a busy driver to see what he needs to see.