One of the features Apple has mentioned for its watch is its ability to use its little force feedback mechanism to make different pulses depending on whether you're supposed to turn left or right, so you don't actually have to look at the directions. It actually sounds like kind of a neat idea.
Definitely an interesting idea. I wonder if haptic feedback for GPS navigation could somehow be integrated into cars. The steering wheel might work.. except people are often pretty bad at keeping both hands on the wheel. Maybe in the seat.
Simple left/right indications are fine for walking, but not for driving. You need explicit lane guidance, or else you'll miss practically all your turns driving a new route.
Even if the GPS is accurate to a few feet, it doesn't know where the back of the line in the left turn lane is!
