Hi all, in a previous car of mine I had the sat nav in the usul place, stuck to the windscreen. I bought a little sun shade type thing that clips over the top of the device and, well shades the sun from its screen. Is the Maps & More screen difficult to see in bright sunlight and would benefit from a sun shade? What size is the Maps & More screen as I'm watching a 4.3cm shade on eBay? Thanks all.