There is usually a portion of the screen without heating elements. It's also possible to get a cheap re-radiating antenna and basically put the GPS signal anywhere you like. Alternatively, most (if not all) GPS devices accept the input from an internal antenna which can quite often be put under the bonnet. So, if you really want one, even if you have problems with the heated screen, you can get round it
Last edited by selwonk; 6th November 2005 at 07:37 PM.