You can do Google Maps/WAZE just fine on a phone (or 2 phones if you and your wife would like to have a good close-up view) as the travel area displayed is only a small portion of the path ahead, even on a large display. The voice commands are excellent and give you plenty of lead time to get into the proper lane and ensure you are at the right intersection. We bought a 10" tablet that we could mount in the middle for both to see but found we were actually happier with a phone mounted close to the driver.