I made my own mount extender (the same thing that TT charge a small fortune for) and fitted it to the GPS mount bar. I'm fairly sure there is another thread about this already, but here goes.
I did have it on the handlebars, using the RAM mount and it was fine, no problems. I just didn't like it out of my field of vision so I moved it to thr GPS bar. I'm not sure what Yamaha were thinking but the GPS bar is useless, because of the screen you cannot actually get a GPS mounted on it! So into the workshop.