Today i put a RAM waterproof box in the cockpit area for my TomTom,this was quite expensive,but an item that needs to bought once,it has a Gel type waterproof flexi screen which is replacable
the box is large enough for a sat nav and a phone
can be used at any angle,the smaller Ram box is good for a small ipod type device
http://www.ram-mount.com/aqua_box_mount ... _mount.htm