How can it be that a Mazda CX-7 Grand Touring with a sticker price close to $30,000 doesn’t have a trip computer? Guess that’s part of the optional navigation system. Our test CX-7 did have a Bose Audiopilot sound system with six-disc in-dash CD changer. The control buttons are huge and clearly labeled, a big center knob controls power and volume, and secondary knobs handle tuning and audio settings. The main flaw is that the display is located at the base of the windshield rather than with the stereo controls; given the amount of vacant real estate just above the climate system, this seems an odd choice.