Navdy: A dashboard gadget that will totally change how you drive

Navdy, a $499 heads-up display system, is on the front end of a category-altering technology

It was the last car on the rental lot: a white Nissan Altima that looked as if it had hit every pothole and puddle between Ohio, where it got its licence plate, and Fort Lauderdale, where it was now parked.

I was at the beginning of a long weekend and had about 600 miles of driving ahead of me. This time, I vowed, I would give myself the kind of upgrade the rental agency wouldn’t —a heads-up display from Navdy, a $499 aftermarket gadget that sits on top of your dash and gives almost any car that Top Gun feeling.

My usual