Heres the pics of the GPS mount on the Madstad windshield system. The Zumo 595 has a huge cord connector so I cut a hole at the base of the shield that is about 3/8 x 1-1/8 rectangle and it can not be seen through the black base shield also serves as drain hole. GPS is secure and does not shake or vibrate sun glare can be an issue at certain time but not been a problem so far. You can also see the adjustable mount system for the outer shield.
The middle pic is my view from the seat, 15 inch shield all the way down and kicked slightly out at the top.