I was riding on the interstate today and my Nav VI just fell out about 40 miles from home. I looked for it for about 30 minutes to no avail. I was doing 80+ and there was a truck behind me I was trying to get out of the way of. this was actually a new, replacement unit I got because my last unit started “ghosting” after only purchasing the bike about a month ago. with all the problems with the Nav VI is it better to just go down to the Nav V or even IV (assuming it fits the same mount)?