Why ? Just because it fits under the armrest, and the armrest can be 90degree up, or as in the picture. The letter tray slides in under there, and it is a prefect fit.. it does not move.
Well, what should I say. It is a great radio, small and compact, nice to look at and it works great, but it is a lot of menus, a lot of menus under the same buttons. Something as easy as turning up the power, takes several pushes and tunings on the knob. But, besides that, is it a good radio