This app calculates the tips from the total amount including taxes and fees. I don't think that is right. The tip should be calculated BEFORE taxes and fees. Took off one star because the navigation sucks. It's inaccurate and keeps trying to send drivers to the wrong street. Took off yet another star. The app still sends drivers the wrong way to my house. It's too bad I can't post a picture because that would show how bad the navigation is.