Meet GoGolf GPS: a portable voice guided GPS rangefinder that clips to your sunglasses and lets you know the distance from the center of the green for each shot. It combines with the FreeCaddie Audio app to provide you with alerts. You can operate the device with a simple touch of a button.
The device can be clipped to your glasses or cap. It weighs less than 1/3oz and doesn’t get in your way. The companion app has info for 30k+ golf courses.