Stumbled across this device several months ago and pre-ordered one last week because I think it will be game changer. Unfortunately the metal version won't ship until May. It's a much simpler GPS navigation tool then a Garmin or a smart phone and easier to see in the sun. The final device for motorcycle will have mechanical buttons on the side of the dial, to be used with gloved fingers. One of the button selections will get you to GPS Speedometer.
Here's the latest for a better look at dimensions.