Koos - I mounted the X5 course computer inside on the molded cabin locker wall above the stbd quarter berth. I built a small box using Star Board and mounted it next to the course computer. The box holds both the display head and the receiver for the remote. It faces forward so you can see it from the nav station. I figured I didn't need another hole externally for the display if I used the remote. I have not seen any vibration issues with it, then again my Yanmar runs smoothly - for a 2 cylinder engine smile